How did they pack so much comfort and style into such a simple shoe

63% nylon/37% polyester

The On-fan favourite re-engineered with 44% recycled content

including flasks (any model will work)

More benefits

Men's 2XU Aero Top LS Half Zip Size:Large How did they pack soSoft and smooth coverage that can be worn on its own or as an extra layer, the Aero 1 2 Zip has a lightweight breathable mesh back and is easily adjusts at the neck and sleeves so you can stay comfortable as you heat up or cool down. FLEXIBLE VERSATILITY Raglan sleeves provide maximum movement and 1 2 zip design lets you adjust exposure to the elements to your liking with thumbholes at sleeve cuffs providing extra warmth and coverage on cooler days.