Swiftwick Vision Impression National Park Crew Socks - 6" Glacier X-LargeSwiftwick Vision Six Socks 6 inch Impression Glacier X Large. Swiftwick Vision Six Impression National Park socks pay homage to the majestic locations we love to explore. Each sock is made with high performance fibers that wick moisture to keep your feet dry cool and blister free and feature 360 degree prints of these National Parks. Six inch crew cuff features 360 printed designs combining performance and style that protects your calf and leaves a