Boundary, Poly Demi / Brown-Amber Lens Gradient Gold FM Color:Not Applicable The National Topographic System provides

The National Topographic System provides general-purpose topographic map coverage of the entire Canadian landmass

Ultra-slim and lightweight

Made from 100% polyester dobby fabric

It is especially suited for mountaineering and multi-pitch alpine climbs where every grams counts

and rafters

Boundary, Poly Demi / Brown-Amber Lens Gradient Gold FM Color:Not Applicable The National Topographic System providesTR90 and stainless steel come together in this RX ready model to form a frame that looks like it belongs no matter where you wear it. Whether you're sporting a bike helmet, a designer suit or a bathrobe that's a little too small, the Boundary is the frame that always makes sense. This is partially due to its adjustable parts and hydrophilic pads that become more grippy when wet.