TYR RD-1X Review: A TYR-riffic Debut - Believe in the Run。TYR RD-1X Running Shoes Men Sz 9 Pool Low Top Sneakers Lace Up Brand new with box Tackle extra miles in TYR\'s RD-1X running shoes, designed with a lightweight breathable upper, SURGENRG+ midsole and traction outsole. Breathable knit mesh upper with synthetic overlays Padded collar and tongue Lace closure Cushioned footbed SURGENRG+ foam midsole for support and response Heel-to-toe 10 mm drop Grippy rubber outsole with flex grooves to enhance natural stride and stability support rails SKU# box RN