{"product_id":"kelvin-in-race-neck-cooling","title":"KELVIN ONE","description":"\u003ch2\u003eCool head. Higher ceiling.\u003c\/h2\u003e\n\u003cp\u003e\u003cbr\u003eYour body quits before you do. Above 39-40C core temperature, your nervous system throttles your muscles to protect you: pace drops, heart rate spikes, and your head still wants more. That is not weakness. That is a brake.\u003c\/p\u003e\n\u003cp\u003eKELVIN is a stick-on cooling element you snap to activate on your neck, so you keep your grip while everyone else fades in the second half.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eProof, not hype\u003c\/h3\u003e\n\u003cp\u003e\u003cbr\u003eNeck cooling works mainly through perception. It lowers the heat signal to your brain and delays central fatigue, so you push harder at the same effort.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e+10.5% distance.\u003c\/strong\u003e Runners covered 3,030 m with neck cooling versus 2,741 m without, in a heat time-trial. Source: Practical neck cooling and time-trial running performance, Eur J Appl Physiol\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe brake is central.\u003c\/strong\u003e Above 39-40C your nervous system cuts muscle efficiency to prevent overheating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe neck is the spot.\u003c\/strong\u003e High thermoreceptor density near large blood vessels makes it the fastest signal to your brain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eHonest note:\u003c\/em\u003e KELVIN improves performance and your sense of grip through heat perception and central fatigue. It does not claim to lower your measured core body temperature, and it is not a medical device.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"KELVIN","offers":[{"title":"Default Title","offer_id":60047767568718,"sku":null,"price":29.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1053\/1582\/8046\/files\/hf_20260625_123243_3a88ea20-01e3-43ee-aea1-713bb1de2520.png?v=1783261958","url":"https:\/\/kelvinperformance.com\/products\/kelvin-in-race-neck-cooling","provider":"KELVIN Performance","version":"1.0","type":"link"}