The Castelli Nanoflex arm warmer is great for riders that want a little bit of extra warmth and protection without having to have an extra layer; these arm warmers can be worn for those early morning rides when there is a crisp chill in the air and then whipped off when it starts to heat up midday. Alternatively, these arm warmers can be stashed in your pack just in case the weather takes a turn for the worse and you need extra protection from the elements, they are compact too as well as lightweight so you won't even notice them in your bag.

The arm warmer is breathable and stretches with ease so that you get the perfect fit without it being restrictive and also adds support. The Nanoflex arm warmer fabric is water-resistant which is ideal when you don't know how the weather will pan out and because it is water resistant you won't get soaking wet in a shower and be wet for the rest of the day. This is a must buy for cyclists that don't like to wear one-too many layers!

Castelli Nanoflex Arm Warmer Features

• Water-resistant NanoFlex fabric
• Same breathability, stretch and warmth as Castelli's standard Thermoflex warmers
• Double-sided silicone grippers keep the warmers in place
• Great in every possible condition