Montbell UL Thermawrap Parka Men's Footwear Hiking Boots it's a bag shaped design with it's a bag shaped design with an extra wide elasticated cuff to easily slip their hand right in Clam shell opening main storage and small zippered pocket hydration bladder sleeve with hose port quick access compression storage (helmet compatible) small zippered front storage pocket 2 mesh side pockets (water bottle compatible) trekking pole attachment 2 zippered waist belt pockets rain cover included reflective trim A stretch fabric across the shoulders combined with Stretch Exceloft insulation allows good arm mobility even when layering This ultralight piece of insulation was originally designed for high output aerobic endeavours where weight is a concern