I,ve spent 5 decades hunting in a wide range of temps, I purchased several parkas over that time,
now obviously we need to define (cold/temps) to me thats under 10F- down to maybe -30F with wind chill temps
use gortex and synthetic insulation like thermaloft , get a parka with a hood
just some well-proven tips you need several layers,
you may be sitting near motionless for hours,
bring a few high-calorie snacks youll be warmer if not hungry
carry an insulated pad to sit on,Therm-A-SEAT Traditional Series Insulated Hunting Seat Cushion
moisture from perspiration or rain is your enemy,
Gortex is useful, dressing in layers is smart,
thermal under wear is well worth the cost.
you want a good thermal vest
https://www.eddiebauer.com/p/1011213...SABEgLZ4_D_BwE
that can be put on over a flannel shirt
https://www.duluthtrading.com/mens-f...jac-89327.html
and under a parka
real down insulation is useless if it gets wet.
a long waist flannel shirt over long underwear helps a great deal,
https://www.cabelas.com/catalog/prod...ref=prd2816402
one common huge mistake is in trying to exert yourself through hard hiking, while bundled up
,you build up heat sweat,while exercising, let excess heat out you can,t afford to sweat.
get clothing moist and it drastically reduces thermal efficiency
as a result of the moisture build up your cold shortly after you stop,
open the parka at least partially while hiking .
don,t put on the vest or balaclava untill you cool from hiking in,
carry a fleece balaclava to put on after you cool down from hiking , keeping your head and neck from losing heat goes a long way towards keeping warm
one tip, is to buy the best quality you can afford in at least one size larger than you might expect, a loose fit has several big advantages,
(1) dead trapped air adds significant heat retention
(2) having room between the inner parka and flannel shirt for a synthetic down vest to fit loosely helps a great deal
(3) have a backpack to store a vest, balaclava and rain poncho
a wide brim felt hat keeps the suns glare out of your eyes, but buy one a size or two, too large you may need it over a balaclava