During a meeting over coffee with Varusteleka, they showed me the Särmä TST L5 Thermal Patrol Coverall.
It is an update to a popular Finnish Army issue item which was designed in the mid-80s and used when in static positions like guard duty and lying up in an OP.

It features dual front zippers and two side leg zips for easy donning and doffing. The front zippers also allow venting and integration with plate carriers and chest rigs.

It is made from 100% polyamide ripstop (70g/m2) with a non-fluorinated water-repellent treatment in the Finnish M05 winter camo print. The coverall is also insulated with 67g/m2 Climashield Apex which allows you to remain comfortable in temperatures as low as -35°C / -31°F.
Features:
• Helmet-compatible hood with a short visor
? Adjustable face opening and head circumference
? Hanging loop
? Removable neck flap
? The entire coverall can be packed into the hood
• Two front zippers
? Wind flaps with hook-and-loop closure
? The wind flap can be closed out of the way with its own hook-and-loop
? Wind flaps have loops for various attachment methods (see usage methods)
• 2-way ventilation zippers in the armpits
• Adjustable waist with elastic band
• Internal suspender loops
• Separate zippered fly for field relief
• NIR-compliant, M05 Snow Pattern color
This coverall is made in Slovakia by Koutny and comes in three sizes.
www.varusteleka.com/en/product/sarma-tst-l5-thermal-patrol-coverall