The Massif® HotJohns® Crew made with DuPont™ Nomex® brand fiber is a versatile Level 1 or 2 baselayer option.The Massif® HotJohns® Crew is a versatile baselayer piece. It can be worn next to skin or over a Massif® Cool Knit® layer. The design is streamlined for easy layering and is highly breathable, wicking moisture away from the skin, keeping you warm and dry even when you're working up a sweat. Extra length in the back keeps the torso tucked in without excess bunching.Constructed with DuPont™ Nomex® brand fiber, the first flame-resistant fiber selected for use in military uniforms. DuPont™ Nomex® fibers carbonize and thicken when exposed to the intense heat of a flash fire, creating a protective barrier that reduces or prevents burn injuries. HotJohns garments will be a favorite in your layering system.Product Features: Full flame-resistant construction with proprietary Massif® fabric 4-way stretch Excellent moisture management Lightweight Crew collar Designed to work with the Massif® Fire and Ice™ layering system Approved by NAVAIR Authorized by the United States Coast Guard USAF Authorized Safe-To-Fly Product Downloads HotJohns_2020 Size guide