Product details:

The Air Undershirt III is easily packed down small, folded into its own back pocket so you can easily pop it in a jersey pocket. After cresting a climb put it on for the descent, or use it to keep off the chill on an early morning start. Made from environmentally friendly materials and certified in accordance with the strict bluesign system environmental standard, the athletic cut is streamlined to minimize flapping. Vaude use Eco Finish for this undershirt, an environmentally friendly water-repellent finish without fluorocarbons (PFC). It also carries their VAUDE Green Shape label, so you can be confident that this product is manufactured in an eco-friendly way and using sustainable materials, proving great cycling kit doesn't have to hurt the environment.