Endura's Windchill Knee Warmers keep you protected from the coldest of winds. Made from Thermolite with a High Performance Repel TEFLON fabric protector for ultimate weather comfort and water repellency. Top Features of the Endura Windchill Knee Warmers Thermolite with High Performance Repel TEFLON fabric protector for ultimate weather comfort with durable water repellency Ergonomic cycle specific fit Reflective flashes / logo Knit fabric with windproof / breathable membrane on front leg Silicone strips at thigh to grip to short Product Data Road: Yes Thermolite Ideal for cold weather cycling, Thermolite uses hollow-core fibre technology to create an insulating layer of warm air. The result is a lightweight, warm fabric with superior moisture vapour transport properties that doesnt get heavy even when wet. The Thermolite quality developed by Endura has the added benefit of a High Performance Repel TEFLON fabric protector finish (from DuPont).