Smartwool Merino 150 Base Layer Long Sleeve vs Smartwool Merino 250 Crew
Weight and specs compared for 2026 — and which one to choose.
Lightweight merino-blend long-sleeve base layer (men's) with natural odor resistance for all-season layering.
Midweight merino base layer for cold-weather hiking.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
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Smartwool Merino 150 Base Layer Long Sleeve vs Smartwool Merino 250 Crew: which should you buy?
If saving weight is your priority, the Smartwool Merino 150 Base Layer Long Sleeve wins — at 150 g it is 120 g (44%) lighter than the Smartwool Merino 250 Crew (270 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.
See where both rank against everything else in this category on the lightest clothing - base layer page, or browse the full gear weight database.