The Pro Seamless arm warmer from Castelli can be used across a wide range of temperatures and is highly stretchable.

These arm warmers are made of a blend of polyester (78%), nylon (15%), and Lycra (7%), making them extra stretchy, lightweight, and warm.

The sleeves are designed with as few seams as possible to increase comfort. Additionally, the sleeves can be folded up very small when extra warmth is not needed.

Specifications and features:

• Weight: 67 g
• Provides extra warmth without overheating
• Material: polyester (78%), nylon (15%), and Lycra (7%)
• Can be packed small for easy storage
• Minimal seams