Halcyon 400 denier is the big brother of our Halcyon 200 denier, and in a way, a cousin to 420HT Parapack. Made for us in Japan, it's a ripstop fabric woven of 420 denier nylon (base fabric) with a square grid of 400 denier UHMWPE (ultra-high-molecular-weight polyethylene) yarns every .25" / 6mm. UHMWPE is one of the strongest fibers known to man, and is almost impossible to tear.

The Aeronaut 45 is now in stock and ready to ship in the following Halcyon 400d exterior color combinations:

Black Halcyon/Ultraviolet
Black Halcyon/Wasabi
Black Halcyon/Northwest Sky
Nordic Halcyon/Iberian
Nordic Halcyon/Northwest Sky