Rather than trying to get fancy here, Castelli stuck with the basics of great fabric and functional construction. They use outstanding stretchy and warm Thermoflex fabric in a minimal construction to eliminate seams.
Castelli Armwarmer Features:
86% Polyamide(Nylon), 14% Elastane(Spandex)
Full thermal protection
Fleece inside for comfort and warmth
Silicone gripper elastic
Buy Castelli Clothing from Chain Reaction Cycles, the World's Largest Online Bike Store
Black - Yellow, Black - Drive Blue, Black - Red