ThirtyTwo Women's Shifty Boa W's Snowboard Boots The women's single-boa® shifty pairs an ultra-soft interior with an evolution foam outsole for effortless all-day comfort. The name of the game is all-day comfort with the Shifty. Offered in a single Boa system the Shifty is designed with an ultra-soft interior. It pampers your feet with a cushy Comfort Tongue, soft Evolution Foam outsole, and plush Comfort Fit liner. Easy to step into and effortless to ride, this boot is perfect for anyone seeking maximum comfort without compromise.