3mm O'Neill Tropical Dive Boots The 3mm tropical dive boot by O'Neill is a great little boot for lightweight reef protection. Features 100% stretch neoprene, durable flatlock seams, flex traction sole, and a fin tab on the heel for stability. Slip-on design. Sizing Tip: Choose your regular USA shoe size and round up if you're a half size. Example: Men's 9.5 should choose size 10 Thickness Chart:*Water temperatures are only guidelines. Many variables such as water temperature, depth, duration, and personal water temperature tolerance will impact your comfort level. It never hurts to order a thicker boot. 3mm: Good for temps 60 degrees and up 5mm: 50 degrees and up 7mm: 40 degrees and up "
