Arm warmers are one of the most essential pieces of cycling apparel. They extend the life of a short sleeve jersey well into three seasons and are easily removed if the day gets warmer. The Endura Thermolite Arm Warmer is a great basic arm warmer for cooler days on the bike. Thermolite fabric provides added insulation over Lycra arm warmers, yet isn't quite as hardcore as the Endura FS260-PRO Arm Warmers. The fleece interior feels soft against your skin, and silicon grippers on the upper arm create a slip-free fit. The Endura Thermolite Arm Warmer is available in black and comes in three sizes -- Small/Medium, Medium/Large, and Large/X-Large.