WHY WE MADE THIS:Ascends are designed for people who like a specialist chainsaw pant for the cooler months. Cosy and warm when they need to be but with vents and lots of stretch to make work easy on warmer days. Buy Ascends to complement the light and breezy Zeros.CERTIFICATION:Certified by Underwriters Laboratories (UL) to ASTM F1897-20 for USA and meets OSHA regulation 1910-266in the trees… or in the ground!