thirtytwo Men's STW BOA '11-M, Synthetic and textile Boa Lacing System Rubber Outsole with EVA Cushioning 3D Molded Tongue: Our 3-D Molded Tongues wrap your foot for easier lacing, improved fit and heel hold. This design also gives us the ability to control the stiffness of each model for customized flex and improved responsiveness. Internal Lacing System