100% hand laid fiberglass base Epoxy resin Tongue Air vents Microfiber liner Hand made monocoque construction Heat moldable tongue The Boa Advantage Glove-Like Fit The Boa Closure System provides custom comfort with smooth, even closure and no pressure points. On-The-Fly Get easy, one-handed adjustment with a quick turn of the Boa dial. No more kneeling on wet ice. Powerful Closure Once locked into place, Boa reels and laces stay that way. Normal skate laces stretch 7-10% which is why you need to re-tighten your laces. Durable Made from aircraft-grade stainless steel, Boa laces are stronger per gram than tank armor. Micro-Adjustability Boa reels offer seemingly infinite degrees of fine tuning. Lightweight Boa closures shed water, and ice, shaving precious weight. Fast Quick on. Quick off. Boa saves time putting your skates on.