Under Armour Speedform Slingride Tri Running Shoes - SS17 Synthetic-and-mesh Dyneema - The world's strongest fibre, woven into the upper for the ultimate in durable flexibility. SpeedForm Technology - Delivers an unprecedented precision fit for unrivalled comfort and no distractions. Seamless Asymmetric Zonal Compression - Slingshots your feet from heel to toe. Padded Tongue Construction - With soft sandwich mesh materials to increase comfort and fit. Two-Piece Charged Cushioning - Pairs a soft, plush layer of foam on top of a layer of dense, harder foam for the ultimate blend of support and comfort.