Castelli Pro Seamless 2 arm warmers are the best and seamless. Others on the market are made with a nylon / Lycra® blend that tends to retain moisture, but these offer better breathability with a polyester yarn. However, working with polyester makes it more difficult to find the right elasticity, the right return and manufacturing consistency. These arm warmers are a favorite of professionals because they are incredibly light and extremely warm for their weight, without overheating your arms in milder conditions. They are so stretchy that you will hardly notice you have them and even when you take them off, they will take up much less space than normal cuffs would take up in your pocket.

• Mid-weight seamless arm warmer.
• Surprisingly warm without causing overheating.
• Fully seamless construction.
• Folds up extra small.
• Color: Black.