Extremely warm layer, but also will keep you comfortable if you are doing more than stationary hunting. As someone that runs hot, this is important. Would be a great addition to any hunting clothing system!

I paired these with the furnace Henley and is amazing warmth and comfort for cold hunts.

The catalyst pants and jacket are great. They fit well and are the most comfortable pants and jacket combo I’ve ever worn. I’m 5’9” and the sleeves were a bit long but they fit snug and that makes them the perfect length to mate up with gloves without leaving a gap. They don’t seem well suited for sitting if the wind is blowing. They breath well and I can’t wait to wear them while moving. The furnace long johns and pullover are the perfect weight and also offer great breathing quality. My next purchase will be the sanctuary bibs and jacket. My friend swears by his. I intend to have a complete first lite kit at my disposal for whatever conditions arise.

I've used these in both active and stationary activities in 20deg weather and my legs were always comfortable. Not too hot and not too cold, just the perfect temperature for whatever I'm doing.

These long johns fit great, feel great, and are extremely warm. I wouldn’t hesitate wearing these in to the woods in any temps with just a wind stopper pant. These were part of my first First Lite order and I am impressed.