Men's Base Layers

KLIM SIZING CHART We built the Inferno to be one of our most versatile and comfortable pieces that excels at mid-layer performance as well as bein...

KLIM SIZING CHART The Glacier Jacket is a midweight stretch fleece with moisture-wicking technology and heat-trapping collar for added comfort,...

MID LAYER INSULATION, THE SECRET WEAPON FOR WARMTH & COMFORT / A comfortable mid layer is built from a polyester knit with a hard face outer th...

The 509 FZN Base LVL 2 Pant offers mid layer insulation - the secret weapon for warmth and comfort. A comfortable mid layer is built from a polyest...

KLIM SIZING CHART The Inferno Jogger Pant is one of the most comfortable mid layer pants on the snow, boasting warm, soft fleece fabric and practi...

KLIM SIZING CHART Prepare to experience unparalleled warmth and freedom of movement in any condition with the innovative Aggressor One-Piece 2.0 “E...

KLIM SIZING CHART The Glacier 1⁄4 Zip is a midweight stretch fleece with moisture-wicking technology and a stand-up collar for heat-trapping co...

FZN Stands for Five Zero Nine, not Frozen. The 509 FZN Merino base layer collection makes sure of that. This Merino wool blend is high performance ...

Add the ultimate base layer to your day with the 509 FZN Merino Crew Shirt. Made with a Merino/spandex blend for stretch and all-day comfort, this ...

Every successful day on the sled starts with a good base layer, and the 509 FZN Merino Quarter-Zip Shirt knows this better than most. Made with a M...

KLIM SIZING CHART We built the Inferno to be one of our most versatile and comfortable pieces that excels at mid-layer performance as well as being...

KLIM SIZING CHART The redesigned Inferno Pant is still the most comfortable mid layer pant on the snow, boasting new softer fleece fabric and more...

ALPINESTARS SIZING CHART Knitted, breathable and stretchable base layer designed to provide additional coverage against tire roost while still all...