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SO if wool keeps you warm when it gets wet, does poly as well and at less cost in your opnion?
Poly pro doesn’t maintain the warmth when wet quite as well as wool does, but it will maintain warmth a lot better than wet cotton. Another down side to a lot of the poly pro/synthetics is they maintain body odor more than the natural fibers like wool and silk. Silk is the warmest you can get by weight, but it’s not very durable. If you’re going with wool go with merino. It’s much softer than the wool most of us grew up wearing. Not scratchy at all. You can find merino wool for prices similar to the synthetics as mentioned above ($20 per top and bottom). You’re going to get what you pay for to an extent. It’s not necessary to spend $70 or more on a pair of synthetic or wool bottoms or a top, however the $10 dollar sets you can get aren’t nearly as warm as you’ll get with the midrange prices.
Regardless what you get, the best advice mentioned above is dress light when you’re active. I try to start out slightly uncomfortably cool and warm up as I’m moving. This will prevent sweating/damp long underwear, underwear, socks, boots, etc. Once you get where you’re going or level of activity decreases dress up for the heat.
Something else to remember when you’re dressing for the cold is avoiding cotton such as socks, tshirts, and underwear. You’re defeating your expensive long underwear and boots if you wear cotton underwear or socks and end up sweating. Cotton will not wick. It holds moisture which keeps it next to your skin. If you’ve got sweaty drawers or socks next to the skin you’re probably going to end up with a chill or cold feet.
As important as what kind of long underwear you choose is making sure you’re dressing properly with all of your layers and not overheating/sweating when you’re active.