{"product_id":"duotone-cosmic-sls","title":"Duotone Cosmic SLS","description":"\u003ch2\u003eDuotone Cosmic SLS SUP Wave Hardboard\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eDuotone Cosmic SLS\u003c\/strong\u003e is a high-performance all-wave SUP hardboard for paddlers who want one board that can handle a wide spread of surf conditions. It is designed to give newer wave SUP riders enough stability to progress, while still giving experienced riders the speed, drive and release needed for proper performance surfing.\u003c\/p\u003e\n\u003cp\u003eIf you want a dedicated surf SUP that feels lively without becoming too specialist, the Cosmic SLS is the standout option in Duotone’s 2026 hardboard range. The shape is short enough to turn properly, wide enough to make paddling and take-offs more manageable, and versatile enough to tune with different fin setups as conditions change.\u003c\/p\u003e\n\u003cp\u003eThis is not a general cruising board or flat-water touring SUP. It is built for waves. Choose it if you are ready to move beyond an inflatable all-round board, want a more direct feel underfoot, or need a surf SUP that can work across smaller UK beach breaks, cleaner reef waves and more powerful overhead surf.\u003c\/p\u003e\n\u003ch2\u003eWho is it best for?\u003c\/h2\u003e\n\u003cp\u003eThe Cosmic SLS suits committed SUP surfers who want a board that will help them progress. It is particularly relevant if you already paddle confidently, understand basic surf positioning, and want a board that will make catching, trimming and turning on waves feel more natural.\u003c\/p\u003e\n\u003cp\u003eIt is also a good option for experienced SUP surfers who do not want to carry several different surf SUPs. With its 4+1 fin setup, the Cosmic SLS can be tuned for grip, release or looseness depending on the conditions.\u003c\/p\u003e\n\u003ch2\u003eWho might not suit this board?\u003c\/h2\u003e\n\u003cp\u003eIf you mainly paddle on rivers, canals, lakes or sheltered coastal water, look instead at our \u003ca href=\"https:\/\/www.thesupco.com\/collections\/paddle-boards\"\u003epaddle board collection\u003c\/a\u003e or \u003ca href=\"https:\/\/www.thesupco.com\/collections\/composite-paddle-boards\"\u003ecomposite paddle board range\u003c\/a\u003e. If you are buying your first SUP and want something forgiving for general paddling, an inflatable all-round or touring board will normally be a better choice.\u003c\/p\u003e\n\u003cp\u003eIf you are unsure whether a dedicated surf SUP is right for you, our \u003ca href=\"https:\/\/www.thesupco.com\/pages\/sup-test-centre\"\u003eSUP Test Centre at Woodmill\u003c\/a\u003e is the best place to compare boards and talk through sizing before committing.\u003c\/p\u003e\n\u003ch2\u003eShape and bottom design\u003c\/h2\u003e\n\u003cp\u003eThe Cosmic SLS uses a round-point nose to improve stability and wave entry at paddle speed. This helps when you are paddling into weaker waves, dealing with white water or setting up early for take-off.\u003c\/p\u003e\n\u003cp\u003eUnderneath, the bottom shape moves from a flat single concave up front into a flat double concave through the standing area, then into an opening V towards the tail. In plain English, that means quicker acceleration into the wave, a more stable platform under your feet, and cleaner release through the end of the turn.\u003c\/p\u003e\n\u003cp\u003eThe moon tail works in a similar way to a swallow tail, giving the board counter-pressure and hold when you push through tighter, more pivoted turns. It helps keep the board responsive without making it feel nervous when the wave has more power.\u003c\/p\u003e\n\u003ch2\u003e4+1 fin setup explained\u003c\/h2\u003e\n\u003cp\u003eThe Cosmic SLS is supplied with a thruster fin set, but the 4+1 box layout gives you far more tuning options than a standard 2+1 surf SUP.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThruster:\u003c\/strong\u003e the standard setup and the best starting point for most riders. Balanced, controlled and predictable across a wide range of waves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuad:\u003c\/strong\u003e adds drive and hold for faster, more powerful waves where grip through the face matters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwin:\u003c\/strong\u003e creates a looser, more skatey feel in smaller or softer surf where you want flow and release.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwin plus trailer:\u003c\/strong\u003e keeps the twin-fin looseness but adds a touch more direction and control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFull Custom SLS construction\u003c\/h2\u003e\n\u003cp\u003eSLS stands for \u003cstrong\u003eStrong Light Superior\u003c\/strong\u003e, and on the Cosmic SLS it means a full custom-style build rather than a basic moulded hardboard construction. Each EPS foam core is individually CNC-milled before being finished with Biax-Composite-PVC Sandwich technology.\u003c\/p\u003e\n\u003cp\u003eThe benefit on the water is a board that feels stiff, direct and light underfoot. That matters in SUP surfing because you need the board to accelerate cleanly, respond quickly to foot pressure and hold its shape through turns rather than feeling dull or delayed.\u003c\/p\u003e\n\u003ch2\u003eSize guide\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e \u003ctable\u003e \u003cthead\u003e \u003ctr\u003e \u003cth\u003eSize\u003c\/th\u003e \u003cth\u003eVolume\u003c\/th\u003e \u003cth\u003eLength\u003c\/th\u003e \u003cth\u003eWidth\u003c\/th\u003e \u003cth\u003eWeight\u003c\/th\u003e \u003cth\u003eBest suited to\u003c\/th\u003e \u003c\/tr\u003e \u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e8'0\" x 30\"\u003c\/td\u003e \u003ctd\u003e108L\u003c\/td\u003e \u003ctd\u003e8'0\" \/ 243.8cm\u003c\/td\u003e \u003ctd\u003e30\" \/ 76.2cm\u003c\/td\u003e \u003ctd\u003e6.80kg\u003c\/td\u003e \u003ctd\u003eLighter or more experienced SUP surfers wanting the most compact, responsive option.\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e8'4\" x 31\"\u003c\/td\u003e \u003ctd\u003e124L\u003c\/td\u003e \u003ctd\u003e8'4\" \/ 254cm\u003c\/td\u003e \u003ctd\u003e31\" \/ 78.7cm\u003c\/td\u003e \u003ctd\u003e7.00kg\u003c\/td\u003e \u003ctd\u003eA strong middle-ground size for progressing wave SUP riders who still want good manoeuvrability.\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e8'8\" x 32\"\u003c\/td\u003e \u003ctd\u003e140L\u003c\/td\u003e \u003ctd\u003e8'8\" \/ 264.2cm\u003c\/td\u003e \u003ctd\u003e32\" \/ 81.3cm\u003c\/td\u003e \u003ctd\u003e7.50kg\u003c\/td\u003e \u003ctd\u003eA more stable surf SUP size for heavier riders, choppier UK conditions or those stepping down from larger boards.\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e9'2\" x 33\"\u003c\/td\u003e \u003ctd\u003e157L\u003c\/td\u003e \u003ctd\u003e9'2\" \/ 279.4cm\u003c\/td\u003e \u003ctd\u003e33\" \/ 83.8cm\u003c\/td\u003e \u003ctd\u003e8.30kg\u003c\/td\u003e \u003ctd\u003eThe most forgiving size in the range, ideal for larger paddlers or those prioritising stability and wave count.\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e\n\u003ch2\u003eTechnical features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFull Custom SLS construction\u003c\/li\u003e\n\u003cli\u003eCNC-milled EPS foam core\u003c\/li\u003e\n\u003cli\u003eBiax-Composite-PVC Sandwich technology\u003c\/li\u003e\n\u003cli\u003e4+1 fin box system with four multi-fin boxes and central US box\u003c\/li\u003e\n\u003cli\u003eSupplied as a thruster setup\u003c\/li\u003e\n\u003cli\u003eFlat Spot deck shape for a more stable standing platform\u003c\/li\u003e\n\u003cli\u003eRound-point nose for stability and smooth wave entry\u003c\/li\u003e\n\u003cli\u003ePulled-in moon tail for tighter turning and improved hold\u003c\/li\u003e\n\u003cli\u003eSingle concave to double concave to opening V bottom shape\u003c\/li\u003e\n\u003cli\u003e3-stage rocker line\u003c\/li\u003e\n\u003cli\u003eSurf-style rails\u003c\/li\u003e\n\u003cli\u003e4mm EVA deck pad with rear kick pad\u003c\/li\u003e\n\u003cli\u003eDual leash plug\u003c\/li\u003e\n\u003cli\u003eGrab handle\u003c\/li\u003e\n\u003cli\u003eNo mast foot insert\u003c\/li\u003e\n\u003cli\u003eColour: C66 white\/turquoise\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePackage includes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDuotone Cosmic SLS SUP wave hardboard\u003c\/li\u003e\n\u003cli\u003eThruster AS Multi\/US 5\" + 5\" fin set\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePlease note:\u003c\/strong\u003e paddle, leash, board bag and additional fin sets are not listed as included unless shown separately on the product option or order summary. For a complete surf SUP setup, browse our \u003ca href=\"https:\/\/www.thesupco.com\/collections\/paddles\"\u003eSUP paddles\u003c\/a\u003e, \u003ca href=\"https:\/\/www.thesupco.com\/collections\/fixed-length-paddles\"\u003efixed length carbon paddles\u003c\/a\u003e, \u003ca href=\"https:\/\/www.thesupco.com\/collections\/rail-tape\"\u003eSUP rail tape\u003c\/a\u003e and \u003ca href=\"https:\/\/www.thesupco.com\/collections\/car-accessories\"\u003ecar accessories\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eBuying advice from The SUP Company\u003c\/h2\u003e\n\u003cp\u003eWith surf SUPs, volume matters, but it is not the whole story. Your body weight, balance, surf experience, local conditions and how aggressively you want to turn all play a part. A smaller Cosmic SLS will feel sharper and more responsive, but will demand better balance and footwork. A larger size will catch waves earlier, feel steadier in chop and give you more time to improve.\u003c\/p\u003e\n\u003cp\u003eFor most UK paddlers, it is worth being honest about the conditions you actually surf. If your local spot is often messy, weak or cross-shore, a touch more volume can mean more waves and more progression. If you are already comfortable in steeper surf and want more vertical turns, size down accordingly.\u003c\/p\u003e\n\u003cp\u003eNeed help choosing? Contact us or visit the \u003ca href=\"https:\/\/www.thesupco.com\/pages\/sup-test-centre\"\u003eWoodmill SUP Test Centre\u003c\/a\u003e for practical advice before you buy.\u003c\/p\u003e\n\u003ch2\u003eFAQs\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong style=\"color: #000;\"\u003eIs the Duotone Cosmic SLS a beginner paddleboard?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eNo. It is a dedicated SUP surfing hardboard. Confident paddlers who are new to waves may be able to progress on the larger sizes, but complete beginners are usually better starting with a stable all-round inflatable SUP.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong style=\"color: #000;\"\u003eCan I use the Cosmic SLS for flat-water paddling?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eYou can paddle it on flat water, but that is not what it is designed for. The shorter wave shape will not glide or track like a touring board. Choose this board for surf performance, not distance paddling.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong style=\"color: #000;\"\u003eDoes the Cosmic SLS come with fins?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eYes, it is supplied with a thruster AS Multi\/US 5\" + 5\" fin set. The 4+1 box system also allows you to experiment with quad, twin and twin plus trailer setups using compatible fins.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong style=\"color: #000;\"\u003eDoes it have a mast foot insert?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eNo. The Cosmic SLS is designed as a SUP wave hardboard and does not include a mast foot insert.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong style=\"color: #000;\"\u003eWhich size should I choose?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eChoose based on your weight, balance, surf experience and conditions. The 8'0\" is the most compact and responsive, the 8'4\" is a strong performance middle-ground, the 8'8\" adds useful stability, and the 9'2\" is the most forgiving option for larger riders or choppier conditions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong style=\"color: #000;\"\u003eIs this better than an inflatable surf SUP?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eFor proper wave performance, yes. A hardboard gives a more connected, responsive and precise feel on the wave. Inflatable boards are easier to store and transport, but they cannot match the rail control and responsiveness of a dedicated composite surf SUP.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Duotone","offers":[{"title":"8'0\" x 30\"","offer_id":54160385376589,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":false},{"title":"8'4\" x 31\"","offer_id":54160385409357,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":false},{"title":"8'8\" x 32\"","offer_id":54160385442125,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":false},{"title":"9'2\" x 33\"","offer_id":54160385474893,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0904\/8381\/8829\/files\/Duotone_Cosmic_SLS_SUP_43260-1102_C66whiteturquoise_P_1.webp?v=1782339635","url":"https:\/\/www.thesupco.com\/products\/duotone-cosmic-sls","provider":"The SUP Company","version":"1.0","type":"link"}