The idea of Castelli behind the Pro Seamless 2 arm warmers: They should be made of polyester to retain as little moisture as possible. However, the company then faced the challenge of achieving the right elasticity. But research and literally years of patience have paid off: these arm warmers are a favourite piece of the pros because they are incredibly light while being extremely warm for their weight. But even in milder conditions, you won't overheat. 

The Pro Seamless 2 arm warmers are so elastic that you can barely feel them. But when you take them off, they take up very little space in your pocket.

Features:
· Mid-weight seamless arm warmer
· Surprisingly warm without causing overheating
· Unique fabric mix
· Fully seamless construction
· Folds up extra small

Fabrics:
78 % polyester, 15 % polyamide, 7 % elastane