{"product_id":"fast-feet-4-sock-4236356","title":"FAST FEET 4 SOCK","description":"There are lots of so-called aero socks out there. But the Castelli Fast Feet 4 Sock has the development and testing to back up the claim. The few socks that have been tested have probably been tested with a static, nonmoving test because it's easier. But a foot is always in motion, so we created a jig that replicates the movement of the lower leg. And we tested it on actual riders to verify the results. This sock can save 2 watts at 50 km\/h. The newest version has an updated cuff fit for more comfort and aerodynamic gains.","brand":"Castelli","offers":[{"title":"001 \/ s\/m","offer_id":58400762593664,"sku":"4236356_001_58_S-M","price":40.0,"currency_code":"EUR","in_stock":true},{"title":"001 \/ l\/x","offer_id":58400762298752,"sku":"4236356_001_58_L-X","price":40.0,"currency_code":"EUR","in_stock":true},{"title":"001 \/ xxl","offer_id":58400735723904,"sku":"4236356_001_58_XXL","price":40.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/3307\/0720\/files\/01_4236356_001_3852355e-7ef5-4438-b4d9-8195503756ad.jpg?v=1791211643","url":"https:\/\/www.castelli-cycling.com\/en-eu\/products\/fast-feet-4-sock-4236356","provider":"Castelli Cycling","version":"1.0","type":"link"}