ThirtyTwo STW Double BOA Boots. Flex: Soft. - 1:1 Lasting - True Half Sizes. - 3D Molded Tongue - Even flex. - Dual Boa Closure System. - Internal Lacing System. - STI Evolution Foam™ Outsole. - Heel Hold System. - Comfort fit - Moderate support and micro fleece liner. - Molded Footbed.