In the body icebreaker use their merinoloft insulation which provides a warm breathable and natural alternative to synthetic insulations the 100 recycled polyester face fabric features a dwr that sheds light precipitation merino jersey stretch side panels help regulate body temperature on active days and the 100 woven merino lining ensures a cozy feel inside zippered hand and chest pockets keeps small essentials like lip balm snacks and your phone close at hand icebreaker merinoloft