root light 2.5 jacket. the root light 2.5l jacket is built from the lightest waterproof fabric in our collection, making it the ideal piece for spring ski touring, bike rides or summertime summit-bagging missions. perspiration escapes its membrane, keeping you comfortable and dry, while wind and rain are rebuffed. the yarn is made from 40 % post-consumer waste and a protective print on the interior is smooth against your skin. the garment is durable, easy to care for and easy to move in, thanks to its ergonomic stretch.