These are STK-1, size 27cm. I usually wear shoes in the 28.5cm-29cm range, but these fit perfectly at 27cm. I've used them about a dozen times for both training and competitions. I'm selling them because I'm going back to flat shoes, but these are the best squat shoes I've used so far. Please be aware that there are some red threads from the competition venue's carpet and some chalk stains. #powerlifting #training #squatshoes #liftingshoes #benchpress #deadlift #muscle training