Quality clothing, in layers. I walk in with very little clothes on, once settled in my stand I add layers as needed. If you get sweaty, than you will later get cold. Getting damp from sweat will make you miserable. The "hothands" chemical handwarmers are good too. I use boot blankets vs heavy insulated boots. The insulated boots just sweat my feet walking in, than freeze them later. I use uninsulated boots, than ad boot blakets over my shoes after settling in. A hot hands pouch in these will keeop you toasty. Keep feet, hands, and head warm, you will do fine. vests are good too, keeping the body core warm, but giving good mobility for bowshooting.