The Shimano TR31 became so popular and loved by Triathletes that it became difficult to spot any other tri-shoe used to train or race in, so Shimano decided to take their design one-step further to provide you with a shoe that's stiffer, more comfortable and breathes more efficiently ... the TR900's. Designed with an extra-wide strap that provides plenty of room for you to get your feet straight in after the swim, the TR900 provide the perfect ergonomics for triathlon racing. Loopholes at the back of the shoe are multi-purpose. First, they provide a handy place to strap elastic bands through to keep your shoes in the right position, second of all they provide a place for you to secure your finger too which help to get your shoes on properly. The carbon composite found on the sole of the shoe transfers energy into power output efficiently and effectively so you can remain focused on the tactics of the race.