Naturally Sustainable
Machine Wash & Dry
Naturally Anti-Odor
Breathable & Wicking
Versatility. Versatility. Versatility. Did we mention this ¼ zip is versatile? Comprised of our midweight merino wool fabric, it provides the extra warmth and insulation you need when battling the cold. Ideal for when temperatures vary throughout the day, zip it up to utilize the mock neck or unzip it to vent out unwanted body heat. Take it on your next outing and you’ll soon find you won’t leave home without it!
Fabric
- Fiber Content: 100% Merino Wool
- OEKO-TEX® STANDARD 100 Certified
- Woolmark® Certified
- Responsible Wool Standard® (RWS) Certified
- Knit: 245 g/m2 Midweight Interlock Knit
- Microns: 18.5 Micron Fibers
- UPF Rating: 50+
- Total Easy Care: Machine Wash & Dry
- Wool Source: Australia
- Imported.
Features
- Neckline: 1/4 Zip Mock Neck
-
Yoked Shoulders: Seams are offset from your shoulder for a more comfortable backpack fit
-
Tagless Label: No Itchy Neck Tags
- Zipper: YKK Semi-Auto Locking Zipper Pull
- Zipper Garage: Keeps fabric between the zipper and your skin
- Thumbholes
- Light and Packable
- Flat Lock Seams: Prevents Chafing
- Layer Type: Base Layer, Mid Layer, Insulating Layer
- Fit Type: Regular - Standard fit with a little bit of room to breathe, but not too baggy
- Model Features: The model wearing tan is 5'10 / 150 lbs wearing a size medium
-
Runs True to Size - If you like a more athletic, tight fit, try sizing down
- Weight: Size Large = 12.8 oz. (363 grams)
- Style #: 714
Uses
- Ideal Seasons: Spring, Fall, Winter
- Activities: Everyday Wear, Hiking, Camping, Biking, Running, Fishing, Hunting, Snowsports
- Temperature Recommendations: 30°F to 0°F while active, 30°F to 60°F while inactive - Learn More
Care
Washing and Drying Instructions - Learn More
- Turn Inside Out
- Machine Wash Cold: Gentle cycle with like colors
- Detergent: Mild or wool-specific
- Tumble Dry: Low heat
- Storage: Place in an airtight container when not in use for long periods of time
- Do NOT Use: Fabric softener or bleach!
Product Story
Isolation [ahy-suh-ley-shuh n]
When trekking your way to the summit of this mountain you may find yourself in temporary isolation in its pristine forests. As its name implies, Mount Isolation stands alone at the southern end of White Mountain Presidential Range. Epic and alone, it is on the list of New Hampshire’s 48 4,000 foot or higher mountains and often the last peak to be climbed.
Our Guarantee
- 30 Day Satisfaction Guarantee - Return Policy
- 1 Year Warranty
- Extended 2 Year Warranty with Registration - Learn More
- New Hampshire, USA Customer Service
You may also like
MIDWEIGHT MERINO WOOL
- 245 g/m
- 100% Australian Merino Wool
- Machine Wash & Dry
- UPF 50+
Our midweight Merino wool is a go-to choice for cold-weather versatility. It’s warm without being bulky, making it perfect for hiking, skiing, camping, or layering up on chilly days. Wear it on its own in fall or as a base or mid layer during winter adventures. You can learn more about our different Merino fabric weights here.
Temperature (°F)
Activity Level
Benefits of Merino Wool
Great for under my uniform
Fits great for somebody 6’ 1”. Feels very comfortable
Excellent quality product on fit, super soft material type. Product is as expected.
- Excellent quality product on fit, super soft material type.
- Super soft, doesn't wrinkle or smell bad after repeated wearings.
- Great quality and comfort. I can't stop wearing this product!
- 5 stars: 117 (91%)
- 4 stars: 6 (5%)
- 3 stars: 3 (2%)
- 2 stars: 1 (1%)
- 1 star: 1 (1%)
Great for under my uniform
Fits great for somebody 6’ 1”. Feels very comfortable
Excellent quality product on fit, super soft material type. Product is as expected.
Looks great for dress up, wear it with a vest, or great to unzip and enjoy a cool weekend. This shirt is good for cool to cold weather, and is my favorite long sleeved shirt. The weight is really good, it doesn’t wrinkle or smell bad after repeated wearings, it is super soft, and the length is great for me. I’m 6’1”, 180 lbs., and I wear a large.
The midweight 1/4 zip is comfortably warm, soft, versatile (I bought it for cold weather hiking, but wear it most often at home and for gatherings with my friends). It fits me perfectly & the Forest Green & the Burgundy colors are beautiful.
I love this 1/4 zip! For tall guys out there, I am 6'6'' and weigh 245 lbs. I have purchased the Merino 33 tall XL in the past and it actually runs a little long, which is good. I thought I would try a standard XL for the 1/4 zip and it fits great! It is not as along as the XL tall but it really fits well. I would say it is also more like a 1/2 zip than 1/4 zip which makes it a perfect layering top for walking or hiking. You can un zip it to vent when you start geting warm. Love this product!
I cannot say enough about Merino33 and their products. I am slowly moving away from all of my synthetic cold gear and going to Merino wool.
This wool is soft and light. It will be great for early season upland hunting as a top layer. It will be a great base layer later in the fall. The large size has a LONG torso, tall folks will enjoy tucking it in. The cut is more of a slim/sport cut, so go bigger if your chest/belly are on the larger side.
Best warm base clothing
It's warm for its weight and is less itchy than other merino wool garments, so I really want it to work. But the two I bought a year ago have small holes where my hip belt rubs. I wear a shirt or jacket, so the strap isn't directly rubbing against it. I got this one on sale and am giving them one last try.
Other brand merino tops I've tried aren't as comfortable—I'll admit to being sensitive—but they do wear better.
Like it very much, the tall size is excellent, soft wool feel. Dislike it was made in China.
This Midweight wool 1/4 zip shirt is perfect for those chilly, windy, misty morning runs of the PNW! I ran with a moisture wicking t-shirt underneath and it was perfect for 40F weather, and I'm sure I would be comfortable running down to the 30s with the same set up.
This is my first product from Minus33 and I am impressed with the quality!
Highly recommended!
Very pleased with comfort and warmth. Probably could have ordered the heavy weight and wore less layers . But this one is just fine also. Would order again. The clothing feels thin but it provides the warmth as promised. So no bulk is a good thing.
Great quality and comfort. I can't stop wearing this product!! Its warm and soft. The quality it top notch. No loose strings or defects. I bought a second one a week later. I have several different items from minus 33. I see more products in my future. Keep up the great work!
I went to your store and was disappointed that I could not purchase items in person. I do like your products but I like to see what I'm buying.
Hi Mike,
Thank you so much for reaching out — and we’re truly sorry for the disappointment regarding your visit to our Ashland, NH location. We completely understand how frustrating it can be to make the trip and find out that we don’t have an in-person retail space.
Our headquarters and fulfillment center in Ashland are dedicated to processing and shipping all of our online orders as quickly as possible. Unfortunately, we’re not currently set up for in-person shopping or product pickup at this facility.
That said, we’d still love to help you find exactly what you’re looking for! Our full line of Minus33 Merino Wool products is always available at Minus33.com, and our team is happy to assist with sizing, product recommendations, or any questions before you order.
We truly appreciate your interest and support — and we hope to serve you soon through our online store.
Warm regards,
The Minus33 Team
I wore the Midweight Men’s 1/4 Zip paired with the Midweight Men’s Crew and a light windbreaker for split snowboarding, and it was all I needed. Through changing weather and fresh snow, this layer kept me warm, dry, and comfortable without feeling bulky. It breathed well on the climb and kept in the heat on the way down. The ideal balance of warmth, performance, and simplicity.
Everything as advertised. Warm and good fit. The only problem I have now is I want to wear it all the time.:)) Highly recommend this product.
Hi Alan,
Thank you for taking the time to leave a review for our Midweight - Isolation Men's 1/4 Zip 100% Merino Wool shirt. We are thrilled to hear that the shirt is living up to your expectations and providing both warmth and a good fit. We can definitely relate to the struggle of wanting to wear it all the time! Have you checked out our Wolverino line? We have a wonderful 1/4 Zip that is lightweight enough to wear all the time!
Thank you for your recommendation, it means a lot to us. Happy to have you as a satisfied customer!
Thank you again Alan!
Have a wonderful day!,
Sue
Great product, medium weight, and warm soft wool next to the skin. The thumb loops, and stitching are quality. Would buy again. Thanks Minus 33 for good quality apparel.
Warm and quality. I believe the brand’s claim of warmth until 32F while inactive. 0F while active also seems easily feasible.
Over the past several years I have purchased numerous mid-weight tops and bottoms. At first they were great. Warm, well fitting and comfortable. However, after a few washings (I did use the Nikwax wool wash) the material began to disintegrate on all my tops and bottoms. I haven't even worn them a lot, just for the few cold deer hunting days we get here in Georgia. I now have numerous random holes in all of them. Some holes big enough for my toe to fit through while putting them on. For the price they should last longer. I did contact Minus33 customer service and they ridiculously suggested I was wearing velcro next to the material.
The neck gaiters and gloves I purchased have lasted and I have had no problems with them. Seems to be a problem with the mid-weight material.
Great item, perfect weight for layering. I have purchased several over the years and they never disappoint. Buy with confidence and great gift idea.
George,
Thank you so much for taking the time to leave such a positive review. We're thrilled to hear that our Midweight Isolation 1/4 Zip has been a reliable and versatile addition to your wardrobe. We truly appreciate your continued support and hope to continue providing you with high-quality products in the future.
-Minus33
Very soft, very warm
This latest addition to my Minus 33 collection reminded me of the first time I tried wool base layers.
It was another brand - big name. When they arrived, I held a meeting with them.
I paraphrased the promotion speech Lieutenant Jean Rasczak, from the Starship Troopers movie, gave to any newly promoted soldier: You’ve got the job until you fall apart, or I find something else.
They were midweight, but seemed lacking in warmth. I found them more lightweight for me.
A time later, I discovered Minus 33. Thought I'd try them (always looking to improve my gear).
After testing out Minus 33, I held another meeting with my first wool baselayers.
I announced I had found something else.The original wool baselayers needed to pack quickly, as I had booked them on a one-way flight to Whiskey Outpost, leaving in 30 minutes.
Dear valued customer,
Thank you for taking the time to leave a review for our Midweight Isolation Men's 1/4 Zip 100% Merino Wool base layer. We are thrilled to hear that you have found our product to be the 'Summa Cum Laude' of midweight wool base layers.
We always strive to provide our customers with the highest quality products and we are glad to know that our base layer has exceeded your expectations. We appreciate your comparison to a popular brand and are honored to be chosen as your top choice.
We hope that our product will continue to keep you warm and comfortable during your outdoor adventures. Thank you again for choosing Minus 33.
Best regards,
Minus 33 Customer Service Team
I love the Midweight - Isolation Men's 1/4 Zip made of 100% Merino wool! It fits perfectly and has a nice feel to it. But more importantly, it keeps me toasty warm. It also looks great. I will definitely be buying more parallel from. Minus 33!
Greg,
Thank you for your review. We're thrilled to hear that the Midweight 100% Merino Wool Isolation Men's 1/4 Zip is the perfect midweight item for you. We pride ourselves on providing high-quality and warm products, and we're glad to hear that it fits well and looks great on you. We appreciate your support and hope you continue to love our brand. Stay warm! - The Minus 33 Team
I love the 1/4 Zip Midweight “Isolation” for my base layer top. It’s soft and warm and has a garage for the zipper pull to park in. I prefer the Minus33 Merino products over my Smartwool gear.


