Tops

Essential Apparel Basic Thermal Top - B800Ls
Brand: Essential Apparel
Traps and retains body heat

Smartwool Men's Lightweight Crew Thermal Top - 14-603
Brand: Smartwool
Flatlock seam construction eliminates chafing

Duofold Insulayer 2-Layer Long Underwear Pant - 620B
Brand: Duofold
2-layer long underwear fabric traps air creating a thermal barrier

Duofold Insulayer 2-Layer Long Underwear Crew Neck Top - 620A
Brand: Duofold
2-layer long underwear fabric traps air creating a thermal barrier

Duofold Insulayer Originals 2-Layer Long Underwear Tall Pant - 400E
Brand: Duofold
This Duofold long underwear features a 100% cotton inner layer for softness

Under Armour Men's Cold Gear Longsleeve Mock - 0512
Brand: Under Armour
Warmth without the weight

Duofold Varitherm Expedition Weight 2-Layer Long Underwear 360 Stretch Pant - 820B
Brand: Duofold
This Duofold thermal long underwear is Heavyweight but comfortable

Duofold Insulayer Expedition Weight Military Long Underwear Fleece Crew - 436A
Brand: Duofold
Specially made by Duofold to meet tough military specifications

Duofold Insulayer Expedition Weight Military Long Underwear Fleece Pant - 436C
Brand: Duofold
Specially made by Duofold to meet tough military specifications

Duofold Insulayer Originals Long Underwear 2-Layer Unionsuit - 400F
Brand: Duofold
This Duofold Unionsuit features a 100% cotton inner layer for softness