Venturing off-trail and into the unknown requires outerwear that allows you to remain agile without sacrificing warmth, comfort or the ability to stay dry -- it also needs to be durable. Trees and branches are tough on outerwear and that's where the 3L shell construction that the Flylow Billie Coat has comes into play. 3L hard shell ski jackets are more abrasion resistant and also a little bit stiffer feeling, jackets like the Billie Coat are meant to last the test of time and well aggressive skier abuse. Flylow on all of their pieces reinforces seams so that skiers that get angled out on the hill don't pop a seam. This is a jacket for a hardcore skier babe. We had a chance to test this jacket for the 22/23 season and man did we put it through the ringer. Multiple testers, a few crashes, days in trees and plenty of pizza, beer and parking lot stains. The Billie is truly indestructible.