REI Co-op Magma 30 Smartwool Merino 150 Base Layer

Designed for women, REI’s 1.5-pound mummy bag has slimmer shoulders but more room around the hips, knees, and feet than most sleeping bags. Those tweaks contribute to “a fantastic warmth-toweight ratio.”

$319, rei.com

Source: For all-around comfort in a tee, nothing beats Smartwool. Merino wool fibers wrap nylon thread in a soft, durable fabric that wicks moisture and regulates temperature. “Plus, it doesn’t stink when you work up a sweat.”

$75, smartwool.com Source: