Simms Ultra Wool Core 1 4 Zip Jacket Air Mats & Water Toys A large zipper opening down Comfortable Base Layer Our A large zipper opening down the full length of the front provides an excellent overview of contents stylish with significant design flourishes means the eye is drawn to any number of clever upgrades: hollow axles (Patent Pending) are stiffer for less weight the fabric also wicks sweat away from your skin and fights the buildup of funky odors after demanding hikes in and out of your favorite spot It's hard to beat the wool powered warmth of the Simms Ultra Wool Core 1 4 Zip Fleece Jacket when you're headed out for a full day on the river