Constructed from a woven fabric, the Aerolayer Running Gilet is lightweight and water-repellent. Its soft feel delivers breathable warmth, for maximum comfort. Quilted chevron at the front panel has a polyester void fill to help keep you warm whilst still providing airflow. The construction allows cool air to permeate and hot air to escape, circulating fresh air around the garment to keep you feeling fresh. The gilet packs down into its own back pocket when not in use, which is ideal if your run starts to heat up. Zippered side pockets can be used to store small run essentials.