In reference to the earlier post about sizing of the Hyperflex suits.... I just picked up a Large Amp-K 5/3. Sizing Chart says: Large: 40-42" chest, 35-37" waist, 170-190Lbs, 5'11" My measurements; 41"chest, 177lbs., 35"waist, 5' 11" It is SNUG! (but not too snug) If you are in-between, lean to the ...