Craft-sponsored Jens Voigt doesn"t need knee warmers, because Jens Voigt"s legs generate enough heat to power a supplementary fifth, and sixth law of thermodynamics. But you"re not Jens Voigt, and that"s why you need the Craft Winter Knee Warmer when it"s time to pack your suitcase full of courage and head out on the January roads. Product FeaturesMaterial: [shell] ThermoCool (polyester, elastane); [backing] polyester brushed microfleeceCuff Closure: elastic gripperRecommended Use: keeping your pistons pumpingManufacturer Warranty: 30 days