Layering Systems: Synthetic vs. Down

Idaho weather is bipolar. You can be sweating in a t-shirt at noon and fighting hypothermia at dusk. The "Start Cold" philosophy and proper material selection keeps you in the game.

Base Layers: Merino Wool

Cotton kils. Period. Merino wool (First Lite, Smartwool) regulates temperature, wicks moisture, and most importantly, doesn't stink after 7 days without a shower.

Mid Layers: Active Insulation

Fleece or synthetic insulation (like Polartec Alpha) breathes while you hike. Do not hike in your puffy jacket. You will sweat, the sweat will freeze when you stop, and you will freeze.

Static Insulation: The Puffy

Down: Lighter, packs smaller, warmer for weight. Useless when wet. Use for glassy weather in August/September.

Synthetic: Heavier, bulky. Keeps you warm even when soaking wet. Mandatory for late season hunts or the wet panhandle.

The Shell

A lightweight rain shell is wind protection and rain protection. Keep it in the top of your pack.