Stearns Adult Floatation Size Chart
  XS S M L XL 2XL 3XL
Chest in. 32 - 34 36 - 38 40 - 42 44 - 46 48 - 50 50 - 52 54 - 56
Chest cm 81 - 86 91 - 97 102 - 107 112 - 117 122 - 127 127 - 132 137 - 142

These are general guidelines only, sizes are not guaranteed. But no worries, since at SunnySports we offer our exclusive PFF Guaranty