Isolation Midweight Men's 100% Merino Wool 1/4 Zip
Versatility is the name of the game with this 1/4 zip. Named for Mount Isolation—one of New Hampshire's 48 peaks over 4,000 feet that stands alone at the southern end of the Presidential Range—this midweight layer provides the warmth and insulation you need when battling the cold. Zip up to use the mock neck when temperatures drop, or unzip to vent when you're working hard. The 100% merino wool construction wicks moisture, regulates temperature, and resists odor whether you're wearing it as a base layer, mid layer, or on its own. Take it on your next outing and you'll soon find you won't leave home without it.
Why You'll Love This 1/4 Zip
- 100% merino wool for natural temperature regulation and odor resistance
- Midweight 235 g/m² interlock knit—warm without bulk
- 18.5-micron fibers feel soft against skin with no itch
- 1/4 zip mock neck with YKK semi-auto locking zipper and zipper garage
- Yoked shoulders offset seams for comfortable backpack fit
- Thumbholes keep sleeves in place during activity
- Tagless label and flatlock seams prevent irritation
- UPF 50+ sun protection
- OEKO-TEX, Woolmark, and Responsible Wool Standard certified
Size & Fit
Regular fit with room to breathe but not baggy. Available in XS-3XL in both regular and tall lengths. Runs true to size—size down if you prefer a more athletic, fitted feel. Reference model: 5'10", 150 lbs wears size Medium.
Regular Sizes:
- XS: Chest 33-35", Sleeve 30-31"
- S: Chest 35-38", Sleeve 31-32"
- M: Chest 39-41", Sleeve 32-33"
- L: Chest 42-45", Sleeve 33-34"
- XL: Chest 46-48", Sleeve 34-35"
- XXL: Chest 49-52", Sleeve 35-36"
- XXXL: Chest 52-54", Sleeve 36-37"
Tall Sizes:
- MT: Chest 39-41", Sleeve 35-36"
- LT: Chest 42-45", Sleeve 36-37"
- XLT: Chest 46-48", Sleeve 37-38"
- 2XT: Chest 49-52", Sleeve 38-39"
- 3XT: Chest 52-54", Sleeve 39-40"
Care Instructions
Turn inside out and machine wash cold on gentle cycle with mild or wool-specific detergent like M33 Nikwax Wool Wash. Tumble dry on low heat. Store in an airtight container when not in use for extended periods. Never use fabric softener or bleach.
Complete Your Look
Layer over the Chocorua crew for added warmth, or pair with Kancamagus bottoms for a complete base layer system. Explore our full Merino Wool Collection from Minus 33, a 5th-generation New Hampshire family business with over a century of textile expertise.
Isolation Midweight Men's 100% Merino Wool 1/4 Zip
Versatility is the name of the game with this 1/4 zip. Named for Mount Isolation—one of New Hampshire's 48 peaks over 4,000 feet that stands alone at the southern end of the Presidential Range—this midweight layer provides the warmth and insulation you need when battling the cold. Zip up to use the mock neck when temperatures drop, or unzip to vent when you're working hard. The 100% merino wool construction wicks moisture, regulates temperature, and resists odor whether you're wearing it as a base layer, mid layer, or on its own. Take it on your next outing and you'll soon find you won't leave home without it.
Why You'll Love This 1/4 Zip
- 100% merino wool for natural temperature regulation and odor resistance
- Midweight 235 g/m² interlock knit—warm without bulk
- 18.5-micron fibers feel soft against skin with no itch
- 1/4 zip mock neck with YKK semi-auto locking zipper and zipper garage
- Yoked shoulders offset seams for comfortable backpack fit
- Thumbholes keep sleeves in place during activity
- Tagless label and flatlock seams prevent irritation
- UPF 50+ sun protection
- OEKO-TEX, Woolmark, and Responsible Wool Standard certified
Size & Fit
Regular fit with room to breathe but not baggy. Available in XS-3XL in both regular and tall lengths. Runs true to size—size down if you prefer a more athletic, fitted feel. Reference model: 5'10", 150 lbs wears size Medium.
Regular Sizes:
- XS: Chest 33-35", Sleeve 30-31"
- S: Chest 35-38", Sleeve 31-32"
- M: Chest 39-41", Sleeve 32-33"
- L: Chest 42-45", Sleeve 33-34"
- XL: Chest 46-48", Sleeve 34-35"
- XXL: Chest 49-52", Sleeve 35-36"
- XXXL: Chest 52-54", Sleeve 36-37"
Tall Sizes:
- MT: Chest 39-41", Sleeve 35-36"
- LT: Chest 42-45", Sleeve 36-37"
- XLT: Chest 46-48", Sleeve 37-38"
- 2XT: Chest 49-52", Sleeve 38-39"
- 3XT: Chest 52-54", Sleeve 39-40"
Care Instructions
Turn inside out and machine wash cold on gentle cycle with mild or wool-specific detergent like M33 Nikwax Wool Wash. Tumble dry on low heat. Store in an airtight container when not in use for extended periods. Never use fabric softener or bleach.
Complete Your Look
Layer over the Chocorua crew for added warmth, or pair with Kancamagus bottoms for a complete base layer system. Explore our full Merino Wool Collection from Minus 33, a 5th-generation New Hampshire family business with over a century of textile expertise.