"Love the relaxed fit, and the quality of the merino feels fabulous. Reminds me of how IB shirts felt a decade ago, only better. The blue is a very nice shade. Great investment. I will buy more over the coming year."

Women's Naturalist Long Sleeve Low Crew $161.00
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Women's Naturalist Long Sleeve Low Crew
- Women's
- First
- 18.4 Micron
- 165 gm2
Why is my size sold out?
Making clothing can be a dirty business, but we strive to keep it clean. Our line is crafted for quality and long-term performance. And we limit what we make: small-batch production ensures every garment is built to the highest standards and finds a loving home. Our approach minimizes landfill waste and uses less energy and water. We know it’s disappointing when a style you love is out of stock, but we appreciate your joining us in our pursuit of the highest environmental standards and carbon neutral impact.
Women's
| Size | Size # | Bust | Waist | Hip | Sleeve | Inseam |
| XS | 0 | 33 | 24 ½ - 5 ½ | 34 ½ | 29 | 29 - 30 |
| S | 2 - 4 | 34 - 35 | 26 ½ - 27 ½ | 36 ½ - 37 ½ | 30 - 31 | 30 - 31 |
| M | 4 - 6 | 36 - 37 | 28 ½ - 29 ½ | 38 ½ - 39 ½ | 31 - 31 ½ | 31 ½ |
| L | 8 - 10 | 38 ½ - 40 | 31 - 32 ½ | 41 - 42 ½ | 32 - 32 ½ | 31 ½ |
| XL | 12 - 14 | 40 - 42 | 33 - 34 ½ | 43 - 44 ½ | 33 - 33 ½ | 32 ½ |
| XXL | 14 - 16 | 44 - 46 | 34 ½ - 36 | 44 ½ - 46 | 33 ½ | 32 ½ |
Next to Skin: Your second layer of skin, hugs the body tight for optimal layering.
Athletic: Snug fit, this layer fits close to the body for a contoured, slim silhouette.
Standard: Not too snug and not too loose, this layer is right in the middle for everyday use.
Relaxed: Loose fit for comfort and extra layering underneath.
Sleeve: With arm slightly bent, measure from the center back of your neck (at your spine) to the elbow and down to your wrist.
Bust/Chest: Measure full circumference of the chest at the widest point, under the arms.
Waist: Measure full circumference of the waist at the smallest point.
Hips: Measure full circumference of the hips at the widest point.
Inseam: Place measuring tape at crotch and measure to ankle.
For any sizing, styling, or general inquiries, please contact us.
NATURE'S BEST, ENGINEERED FOR COMFORT
Field Notes
+- Low-profile saddle stitching and improved fabric stability for long-lasting comfort
- 100% merino wool with a steam finish for a cooler feel and reduced shrinkage
- Moisture-wicking and odor-resistant for all-day performance
- UPF 30+
The Clip
+Did you love the 24 Hour Collection? This is its future.
Fit and Sizing
+Content and Care
+Field Notes
+- Low-profile saddle stitching and improved fabric stability for long-lasting comfort
- 100% merino wool with a steam finish for a cooler feel and reduced shrinkage
- Moisture-wicking and odor-resistant for all-day performance
- UPF 30+
The Clip
+Did you love the 24 Hour Collection? This is its future.
Fit and Sizing
+Content and Care
+Do Not Use Fabric Softeners
Do Not Bleach
Line Dry
Cool Iron if Needed
Overall rating: 4.909091 / 5 from 22 reviews.
AI Generated Review Summary
Summary topics
Review topics: ["fit","color","weight","wool","quality","fabric","feel","shirt","cut","sleeves","neckline","layer","merino"].
Review highlights
Reviews
Great shirt
"Regular fit"
— Kathleen M. (5/5)
Long sleeve crew
"This is a very practical and well cut long-sleeved tee that can be dressed up or down. Fabric is a nice quality thin but not sleazy. I’m pear-shaped, and the cut is generous enough that the shirt covers my hips and waist without pulling. Size medium fits my 5’6” 140 pound frame."
— Elizabeth B. (5/5)
attractive & practical
"I saw an online video recommending Marino wall as ideal for multiple temperature and humidity environments. I ordered this top on a whim, not expecting it to be so thin (I thought it would be bulky--so thin is good!). It's very comfortable. I really love it."
— MARIBETH G. (5/5)
Perfection!
"This top is perfect in every way! More colors, please!! Wearing it for walking, hiking, gardening, working, skiing, around the house, and around town. Love that it’s pure wool, with a graceful hemline, and attractive neckline, and oh, so comfortable. Identical, but with 3/4 sleeves would be nice, too, to stay out of the way when I’m working."
— Nancy H. (5/5)
I don't want to take it off
"I've been slowly replacing all my synthetic clothes with wool, and I now have many different brands of shirts to compare. This is a favorite - the one I reach for All. The. Time. Here's what I love: comfortable, loose fit without feeling sloppy (and not a body fit - I hate body fit); 100% merino yet still smooth and not itchy at all; no fuss -- I can wash a dry with my other clothes rather than having to remember to cold wash and/or to hang dry; the fit is perfect for both going under sweaters and thicker layers and over tanks and tees; it has a normal tee-shirt arm seam, not a raglan seam, so that it can effortlessly go from trail to restaurant (raglan sleeves always scream "workout clothes"); and the low crew neckline is PERFECT. Regular crew necks make me feel claustrophobic, so I usually look for scoop necks, but those sometimes can be too low. Ibex found the perfect compromise on this one. I really hope this gets offered in more colors! (I love the malachite green offered on the Goat shirt, but not the neckline, so I'm crossing my fingers that color comes to the Naturalist. Or a similar jade/emerald color. If it was offered, I'd also buy this shirt in white, navy, cerulean blue, pine green, boysenberry, rosewood. . . anything but pastels, basically. Hint hint, Ibex designers. ;)"
— Erika (5/5)
Perfect first layer for cold weather
"light weight but warm"
— Laurel K. (5/5)
loved
"The color is beautiful. The practicality is perfect!"
— MONIKA L. (5/5)
malachite is sublime
"I always love ibex fabric, and this time they chose one of my favorite colors… I hope that there will be a lot more garments in this rich color throughout the coming years! May the tariff problems be over soon!"
— grace p. (5/5)
Comfortable, roomy shirt
"The shirt is very comfortable, but runs a bit large. I ordered my usual size- Medium. The neck opening is loose and the sleeves are a bit long for me. The cut is looser than other Ibex tops I have purchased in the past."
— Martha S. (4/5)



