VKM Football Lacrosse Rugby Rib Vest Pads, Protect Spine & Kidneys, YOUTH High density foam padding with polyethylene load spreaders for superior protection Breathable vest with elastic straps at back Additional back plate padding for additional spine protection Measure around ribs, about 2-3 inches below the armpits to determine sizing Approximate measurements around ribs (inches): Youth Small: 22"-24" / Youth Medium: 26"-28" / Youth Large: 30"-32" / Youth X-Large: 32"-34"