Acronym ACR-FW-1112 The 'advanced' version of the already improbably advanced GT-J5, the GT-J5A is a profile fit, fully articulated, fully featured, Gore-Tex® Pro Shell jacket. The center front expansion panel increases layering possibilities by giving you the option of adding 6-8cm to the jacket's circumference. Gore-Tex® Pro Shell fabrics take performance and durability to previously unheard of levels. Go anywhere. Do anything.