For my son and a good fit especially around the ark holes as other tank vests he’s tried seem huge . Quite large fitting so a 42 inch chest fits a medium comfortably. Material good thickness and not thin so will keep its shape .Bought in next for convenience however bought 2 at 8 pounds each but priced up on RI tag as 2 for 12 . Would seem a little unfair if Nect didn’t honour this saving - hence 4 star for sneaky selling !!