Castelli Pro Seamless 2 Arm Warmer

A wide temperature range combined with seamless comfort makes these models our most versatile and popular warmers among professionals.

• Mid-weight, seamless arm warmer
• Surprisingly warm without causing overheating
• Unique polyester/nylon/lycra blend (78% / 15% / 7%)
• Completely seamless construction
• Extra small pack size

A better arm warmer
With INEOS Genadiers, we set out to develop a better seamless arm warmer. Others on the market are made with a nylon/lycra blend that tends to retain moisture. However, we realized that we could achieve better moisture management with a polyester yarn. Working with polyester, though, makes it more challenging to achieve the right elasticity, shape retention, and manufacturing consistency. It took a year longer than we expected, but we are all glad we persevered. These arm warmers are a favorite among professionals because they are incredibly lightweight while being extremely warm for their weight. Yet even in milder conditions, they do not overheat. They are so elastic that you hardly feel them. But when you take them off, they occupy a fraction of the space that regular arm warmers would take up in your bag.