Under Armour Speedform Slingride TRI Running Shoes You feel it instantly. From Under Armour SpeedForm's perfect molded heel cup to textiles that wrap your foot in speed. Nobody knows precision fit like UA. SpeedForm Upper The Under Armour Speedform Slingride TRI is constructed with Dyneema which is the world's strongest fibre, woven into the upper for the ultimate in durable flexibility. Dyneema is a high strength material which offers a lightweight feel, breathability and conductivity. Equipped with Under Armour's SpeedForm technology which is a revolutionary molded, seamless heel cup which delivers unrivalled comfort and performance thanks to an unprecedented precision fit. With a seamless asymmetric zonal compression, it slingshots your feet from heel to toe encouraging a natural gait, while the padded tongue construction with soft sandwich mesh materials increases comfort and fit. Two Piece Charged Cushioning Midsole The midsole is equipped with a two-piece Charged Cushioning constructed which pairs a soft, plush layer of foam on top of a layer of dense, harder foam for the ultimate blend of support and comfort. Full-Length Rubber Outsole The SpeedForm Slingride TRI is developed with a full-length rubber outsole which offers fantastic durability, traction and support with less weight.