Here's an excerpt from RPB's HX5 & PX5 Powered Air Purifying Respirator (PAPR) Comparison sheet showing only the features that are different between the two models:

An exceptionally strong steel clasp connected to an industrial-grade PU coil creates a tether suitable for securing small electronic devices in harsh work environments

while the thick PU materials used protects against heat and abrasion

Stitched with Kevlar thread adding strength and burn resistance

Say goodbye to bulky

Vohl Founders Heavyweight Hoodie FP-XL Here's an excerpt from RPB'sBuilt to work hard and wear even harder, the Vohl Founders Heavyweight Hoodie brings serious substance to an everyday staple. At 490gsm, its warmer and weightier than anything in its class more than capable of replacing a jacket on cold days. An extended body length reduces ride up, while heavyweight ribbing adds structure and durability. The embedded kangaroo pocket creates a cleaner finish with more secure storage. Zippered pockets, sleeve pen