Gore Bike Wear Universal 2.0 Arm Warmers. When the weather takes a dive, don't hide inside. Don a pair of Gore Bike Wear Universal 2.0 Arm Warmers and it'll be springtime all year round. These are one size fits all lycra and elastane microfiber, a material that is more about temperature regulation than about simply warming...in this case designed to keep the temperature next to your skin close to the ideal temperature for performance around 80 degrees Fahrenheit. Universal 2.0 arm warmers are also highly UV protective, so rain or snow, you're protected.