Get the right balance of mobility and protection that is ideal for all positions. The Riddell(R) Junior Power JPK+ All-Purpose Football Shoulder Pads are designed for all purpose use. These shoulder pads are engineered with a flat pad design, PVC epaulet straps and belts, the STAC shoulder system, and RipKord Technology which increases mobility without losing protection. Details The Riddell Power JPK SK for skilled positions Riddell RipKord Technology the STAC shoulder system PVC epaulet straps and belts Flat pad design Air management liner system Swivel fronts Back plate is included Measurement Instructions Shoulder Width defined as the distance between the tips of the humerus bones. Due to varying body shapes, sizes are only RECOMMENDATIONS. Riddell Shoulder Pad Sizing Chart: XS= Shoulder Width: 14" - 15"; Chest Measurement: 32" - 34" S= Shoulder Width: 15" - 16"; Chest Measurement: 34" - 36" M= Shoulder Width: 16" - 17"; Chest Measurement: 36" - 38" L= Shoulder Width: 17" - 18"; Chest Measurement: 38" - 40" XL= Shoulder Width: 18" - 19"; Chest Measurement: 40" - 42"