{"product_id":"castelli-fast-feet-4-sock","title":"Castelli Fast Feet 4 Sock","description":"\u003cp\u003e\u003cspan\u003eThere 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 they created a jig that replicates the movement of the lower leg. And they 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.\u003c\/span\u003e\u003c\/p\u003e","brand":"Castelli","offers":[{"title":"Black \/ S\/M","offer_id":57101275070839,"sku":null,"price":40.0,"currency_code":"GBP","in_stock":false},{"title":"Black \/ L\/XL","offer_id":57104007430519,"sku":null,"price":40.0,"currency_code":"GBP","in_stock":true},{"title":"Black \/ XXL","offer_id":57104007463287,"sku":null,"price":40.0,"currency_code":"GBP","in_stock":true},{"title":"White \/ S\/M","offer_id":57101275103607,"sku":null,"price":40.0,"currency_code":"GBP","in_stock":false},{"title":"White \/ L\/XL","offer_id":57104007496055,"sku":null,"price":40.0,"currency_code":"GBP","in_stock":true},{"title":"White \/ XXL","offer_id":57104007528823,"sku":null,"price":40.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0776\/0799\/3635\/files\/cs2603000109.jpg?v=1779116948","url":"https:\/\/veloedge.co.uk\/products\/castelli-fast-feet-4-sock","provider":"Velo Edge","version":"1.0","type":"link"}