Castelli thermoflex leg warmercastelli is always looking to get everything just about right when it comes to warmers and with these thermoflex leg warmers they may well have just cracked it warm and flexiblethe fit eliminates any extra fabric while the fabric itself is extra warm and flexible silicone grippers at the top prevent these leg warmers from slipping down and the cross wrap cuffs at the bottom provide you with extra comfort they also have the added benefit of being able to be put on