This arm guard from the 1K series is designed with a high-density HD2 Polymer foam built to absorb impact, while wicking away sweat and rain. Featuring a reinforced design from the 900 series, the 1K series features added protection and mobility to level up your game. 1K Reasons – The top-of-the-line 1K collection from STX is designed for the elite player who has logged thousands of reps on their journey to become the best. Play Protected – To protect the elite attackman from heavy stick checks around the crease, this arm guard features added side elbow protection that contours around the elbow cap. Form and Function – A breathable sleeve and three-piece pad design provide improved mobility for added dexterity, while the STX 360+ strap holds padding firmly in place without slipping during play. Lighten Up – A high-density HD2 Polymer foam provides premium protection that won’t soak up sweat or rain. Small – 71-90lbs Medium – 91-130lbs Large – 131-180lbs X-Large – 181+lbs