ThirtyTwo Women's STW Double BOA Snowboard Boots The STW Double BOA® has the same great comfort and easy flex but now with zonal lockdown control. Dual BOA® Fit System allows you to lock in your forefoot and control upper stability independently. BOA® Fit System delivers micro-adjustable, precision fit, engineered to perform in the toughest conditions. 1:1 Lasting Dual BOA® Fit System Performance Rubber Outsole 3D Molded Tongue Integrated Internal Lacing Grip & Rip Heel Hold Cozy Cuff Flex: Soft 3/10