Castelli Thermoflex 2 Cuff BlackCastelli Thermoflex 2 cuffs use a polyester base that is not only more effective than nylon at blocking UV rays, but also much better at keeping you dry, which means these cuffs are ideal in both warmer and colder conditions. . Castelli Thermoflex 2 Cuff BlackSpecifications:- Thermoflex fabric is warm, stretchy and soft - One piece fabric construction with flat seams - Word mark applied by thermal transfer - Silicone band on both sides for better gripRef: 4519530010