ThirtyTwo Lashed Premium x Spring Break Boots. Flex: Medium. - 3D Molded Tongue – Even flex throughout. - 1:1 Lasting – True half sizes. - Articulated Cuff – Eliminates shell distortion. - Performance Backstay – Enhanced spine support. - Independent Eyestay – Supportive fit. - Performance Liner – Heat moldable, dual density Intuition foam. - Performance Internal Harness – Additional support, flexibility, and heel hold. - Traditional Lacing. - Tongue Tension+ – Heel Lock Down. - Performance Footbed – Molded Evolution foam with heel cradle, arch support and heel cushioning. - Performance Rubber Outsole – Enhanced grip. - Energy Foam Cushioning - High Rebound Cushioning.