Lost Boys Merino Long Sleeve - VF Series
Soft & Breathable | Odor-Resistant | Durable
What makes this merino shirt amazing?
- Thin, light merino for warm days. Breathable in the heat, comfortable through cool mornings, and soft enough to layer in winter.
- Wear it for days. Pack fewer shirts. Merino’s natural odor resistance lets you go longer between washes.
- Soft against your skin. Built for real outdoor use. Ultra-fine merino and silky Tencel feel great, while a touch of nylon adds strength and durability.
- Stay covered on long days outside. Long sleeves and UPF 30+ fabric give you sun protection without a heavy feel.
- Keep wearing it for years to come. If you ever damage it, we’ll repair it for free, for life.
Risk-free try-on at home.
If you ever damage any of your apparel, we'll repair it for free, for life.
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Your do-it-all merino shirt.
We went on a mission to create the perfect merino shirt. It had to be thin, light, and breathable for warm days, comfortable through cool mornings, and soft enough to wear under warmer layers in winter. Something you could wear for days between washes and trust to hold up to real outdoor use.
The magic is in getting the blend just right. Ultra-fine, no-itch merino naturally resists odor and helps keep you comfortable as temperatures swing from cold to hot and back again. Tencel, a fiber made from wood pulp, helps manage moisture and gives the fabric a cool, silky feel against your skin. A touch of nylon adds structure and durability, helping the shirt hold its shape through repeated wear, washes, and packing.
UPF 30+ fabric gives you sun protection on long days outside. Thumbholes keep the sleeves in place when pulling on another layer, and a built-in locker loop makes it easy to hang after a wash.
From a weekend outside to a multi-day backpacking trip, the Lost Boys makes it easier to pack less and get more use out of what you bring. And if you ever damage it, we’ll repair it for free, for life.
The Lost Boys is part of our VF-Series: our most technical gear, built with the most advanced fabrics, the highest-quality trims, and absolutely no expense spared.
Features & Specs
- Best For: Adventure travel, hiking, backpacking, and everyday wear
- Fabric: Thin, light fabric blends ultra-fine merino, silky Tencel, and a touch of nylon for softness, breathability, and durability
- Odor Resistance: Naturally odor-resistant merino lets you go longer between washes
- Temperature Regulation: Breathable and moisture-wicking for warm to hot days. Comfortable through cool mornings and easy to wear as a base layer in colder weather
- Sun Protection: UPF 30+ fabric for long days outside
- Fit: Comfortable athletic cut for wearing on its own or under warmer layers
- Thumbholes: Keep sleeves in place when pulling on another layer
- Construction: Flatlock seams help reduce rubbing and chafing under a backpack
- Hang Drying: Built-in locker loop makes it easy to hang after a wash
- Series: Part of our premium VF-Series, built with advanced fabrics and high-quality trims
Fabric Details / Weight
- Fabric: 52% RWS-certified Merino Wool, 35% Tencel, 13% Nylon -- RWS certification covers animal welfare, responsible land management, & supply-chain traceability. Tencel adds a cooler, smoother feel & helps move moisture away from your skin.
- Weight: 169g (size M)
- Fabric Weight: 130gsm
- Fiber Micron: 18.9 -- The most durable Merino micron we tested that still maintained a fine, luxurious, zero-itch feel in this tencel / nylon blend.
Wash / Care Instructions
Machine wash cold on a gentle cycle and air dry. If using a dryer, choose a no-heat setting.
We built the Lost Boys for real miles, real sweat, and real outdoor use. A little care helps keep it that way. High heat and rough wash cycles can shorten the life of merino, so keep it cold and gentle.
Shipping / Returns
- Fast & Free Shipping: Available on all U.S. orders.
- Free Returns & Exchanges: Items must be new and unwashed.
- Expedited Shipping Cutoff: Orders placed by 12 PM PST ship the same day. Orders placed after 12 PM PST ship the next business day.
- International Shipping: Free on orders over $100.
- More Info: Visit our Shipping & Returns page for full details.
What Customers Are Saying...
Joaquin
Fantastic Merino Shirt
I traveled with this for a few weeks in a hot, humid environment and just rinsed it out in water a few times to keep it fresh but it never got smelly like a good merino! Fabric is nice and soft.
Ain
Good For Cycling In Cold
Bought it for an extra layer for this winter cycling season. It's light breathes really well and help retain some warmth without overheating. Doesn't retain odor like pure synthetics.
Taylor
Amazing. My standard for KETL stuff, and it delivers.
As with everything I've ordered from KETL, the quality, comfort, fit, and look are awesome.es, expensive, but I'm a minimalist, and each piece of clothing I buy needs to be a 9/10 in all areas. KETL consistently delivers, so the value is there.
Product Overview
The KETL Commitment
We develop premium fabrics and trims, build our gear to last, and back it with free lifetime repairs. If we can fix it, we will, for as long as you own it. Learn more about our Lifetime Repair Program.
We live on an Whidbey Island in the Puget Sound area. I bought this shirt to go on our weekly hikes on Mt Baker and the North Cascades and it preformed wonderfully. It was so comfortable I found myself wearing it for our walks and hikes around home. It does well in July and August but also on a damp cool day in October.
I plan to take 2 of these shirts on an upcoming trip to Kauai in December.
I 6’ tall and currently way 192lbs with a 43” chest.This shirt is a large and the fit is 95% comfortably. It is ever so slightly tight in the arm pits at certain times but I am actively loosing weight and didn’t size up so it will fit 100% perfect for next hiking season. My next order will be for the same shirt in a steel blue color.
I highly recommend the KETL MTN. Lost Boys Merino.
The Lost Boys Merino shirts are amazing! Very soft, comfortable, and definitely don’t stink after I drench them in sweat playing basketball or hiking/running. Definitely buying more.
I love this shirt! It’s lightweight, comfortable, dries fast. Most recent use was on the search for the ketl treasure hunt jars. 30 miles of hiking over two days and this was the go to shirt to keep me comfortable.
Super comfortable shirt. Great fit and no odor even after multiple days hiking. Big fan!
Love the shirt. Very comfortable. I'm about 5'9 and 188 pounds and I have the XL. Fits nice. I could probably get by with the large for a less loose fit if I want. My chest is about 46. I have black and I'll probably get some more colors and try one in the large size.
I’ve tried many merino shirts from various brands and 100% merino never wins. It’s too delicate, shrinks way too much when you mistakenly wash it incorrectly and sometimes can be very itchy.
This merino blend is great. It’s soft, lightweight and shrank just the right amount after taking a risk and just washing it with everything else.
I’m 5’11” & ~195lbs and I find myself between L and XL with some of Ketls gear. I gambled on XL, which was too larger out of the box, and washed it which intentionally shrank it. Fit is good now. Perhaps a little boxy in the torso but it’s comfy and not fitted. I’m so happy with it, I have a few other colors.
I will be buying many more thank you!
Worked great. Took them on a multi-week trip throughout Asia during the summer and could wear them for multiple days before having to wash them or switch them out.
Great shirt, perfect for a dudes backpacking trip — was the envy of all.
Loved these shirts. In the photo I have the short sleeve on underneath and the long sleeve on top. While hiking in high 40’s and 50’s in Glacier they were more than warm enough, during breaks i’d throw on a jacket if needed. Moisture wicking, very comfortable. Super happy with the purchase. Prob buy more in future, would love to see other colors if that’s ever possible?
The nofry Sunhoody is on par with my outdoor research garment for a fraction of the price. I appreciate the button closures, improved hood, and sleeve thumb loops.
This is a fantastic shirt that feels like it will stand the test of time. Lightweight and stretchy but feels durable. Only time will tell how durable it truly is but it's holding up well so far and the lifetime warranty means if I rip it I can get it taken care of instead of throwing it out.
I picked this shirt from the Ketl line because of it's Merino Wool content. It did not disappoint. I've been on hikes, runs, gym workouts, and to work in the shirt so far and it's been great for both. When it showed up I wore it for several days straight to simulate a several day trip and it resists odor like merino should.
My only request was more colors but upon re-investigation of the website it looks like there's been a restock with additional color choices. Way to be ahead of the game boys!
I'm 5'7", weigh about 185, and bought a medium for reference.
I think this shirt can save the planet! I can use for several days doing electrical work, it’s non melting fibers make it safe to work in. It’s comfortable, looks great and to top it off I can wear it for days without washing. No smell! No extra water and power waste. I need to buy more.
Merino wool is life changing . So is Ketlmtn apparel! Days in south Florida sun and I still
Smell nice . Thanks ketl bros
I have been very happy with the Lost Boys Merino LS top. Just wore it for multiple days in a row on a trip to Door County Wisconsin.
It went from hiking along the rocks in sun to a light house in the clouds and wind. Was breathable and kept me comfortable. Just brought that and one short sleeve shirt. Nice to be able to pack light!
