What are your best tricks to survive the wet and dry cold out there?

Edit, heres a tldr:

• Layers: (base layer of either merino wool or polypro, includes socks/ insulation layer that you can remove easily when working/ outer layer that is water and wind proof)

• Fabrics: Merino wool and Polypropylen are the best. Then every single synthetics, then silk. Cotton is finally the worst you can wear and will actively kill you when wet (yes that means your brown shirt)

• Sweat and being wet will kill you

• Better be uncomfortable and dry than comfortable but sweat when you move

• Small liner gloves under your work and artic glove works wonder

• Have atleast a spare of everything, multiple spares for socks

• Take a piss and a shit often

• Fuel the damn coleman and lantern before the end of your shift outside

• Eat food, you lose a lot of calories through heating your body

• High caloric density snack (like nuts) are your friend

• Change your base layer often (especially socks)

• Keep your outer layer OUTSIDE on your kit before entering a tent, shake it off in the morning to break the ice. Itll keep the moisture off and you wont need as much heat to remove it.

• For the love of god please bring your bivy bag and a mattress

• And dont sleep in anything more than a base layer

• Learn what a frostnip and frostbite looks like and how to treat them

• If someone is hypothermic, buddy cuddle almost stripped in a sleeping bag

• Put water in your thermos, and put it either on the side or upside down

• Large mouth thermos are the way to go

• Bring more than 1L of water, atleast 3L

• Having hydration powder (such as biosteel) will help you a lot by giving electrolyte, vitamins and most importantly remove the shitty taste of water

• Unless very well insulated, camelback straw will freeze up

• Hot paws, hot paws, hot paws

• Socks, socks, socks and more socks

• Personal experience that saved my life multiple times: back warmer for muscles (like robax heat wraps)

• Neos are your best friend (if you add a spare sole cut to size with the insides of muckluks you can make improvised waterproof ones. Personnal experience on that)

• Jetboils are either for morale (hot coffee) or survival (under a tarp for example)

• If using goretex socks or plastic bags on your feets, fill them up with as much talc powder you can (actually spread it at every layers for your feets)

• Like ticks during summer, buddy check each others

• Armpits are some of the warmest part of your buddy, you can put your hand inside (or buddy's feets) to warm them

• If doing sentry or trenches, do yourself a favor and bring a mattress and a tarp

• Flak vest can be used in your layer system, its quite warm actually

• Use sunglasses, snow blindness is very real

• Wet ones inside your clothes so they don't freeze up. Wash your ass

• Bring morale boosting snacks (like candies or chocolate). If failure to bring or out but have haybox, steal the small nutella packet and let them freeze up in your pockets

• The lower your tent, the more space you have and more heat you have at ground level. Make sure it is well ventilated so you dont die of carbon monoxyde poisoining

• Small glow in the dark patches on the tac vest, helmet and bag works wonder to find your kit quickly during the night. Works way better than the cat eyes on the helmet/tilly hat