Castelli Pro Seamless 2

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

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

A better arm sleeve
With INEOS Grenadiers, we set out to develop a better seamless arm sleeve. Others on the market are made with a nylon/lycra blend that tends to retain moisture. But we realized that we could achieve better moisture management with a polyester yarn. However, working with polyester makes it more challenging to achieve the right elasticity, shape retention, and manufacturing consistency. It took a year longer than we expected, but we're all glad we persevered. These arm sleeves 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 notice them. But when you take them off, they take up a fraction of the space that regular arm sleeves would occupy in your bag.