Women's Courser Tank
Ultralight performance merino tank for summer conditions. Breathable, quick drying, and odor resistant.
We built the Courser Tank to be the lightest weight performance wool tank for daily miles in hot and variable conditions. Built with MirageWool™, our ultra-lightweight 115 GSM merino blend with Nuyarn technology, it brings forward the best performance attributes of merino wool in a fabric tailor made for days on the trail.
Featuring an open-knit structure, the Courser Tank actively breathes and manages moisture by pulling sweat away from your skin before you feel wet. MirageWool™ doesn’t cling when saturated, maintaining a light, airy feel throughout an effort. The dialed in fit offers total freedom of movement without unnecessary bulk.
Features
Features
Fabric & Care
Fabric & Care
63% Merino Wool, 29% Polyester, 8% Nylon
Fit Guide
Fit Guide
Shipping & Returns
Shipping & Returns
- Returns and exchanges accepted within 30 days
- Orders over $100 ship free
- Unknown Runner Guarantee: we strive to make the highest quality performance merino trail apparel and back everything we make with our guarantee. If it's not up to your standards, simply reach out and we'll do everything we can to make it right.
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Designed in Flagstaff for trails worldwide
Why Merino?
Nature's Performance Fiber
Temperature regulating
The wool fiber structure naturally keeps you cool in the heat & warm in the cold
Moisture Wicking
Merino wool moves water vapor away from your skin
Odor Resistant
Wool fibers trap & neutralize bacteria allowing you to get multiple wears between washes
MirageWool™
Ultra lightweight performance merino for hot + variable conditions
Ultralight
115 gsm open knit performance fabric powered by Nuyarn
Super Fine
Superfine 18.5 micron wool for soft next to skin feel
Performance merino blend
Increased temperature regulation, quick drying, zero cling
Nuyarn Technology
Proprietary yarn technology powering the highest performance fabrics
Unlocking Merino
Twist free yarn technology releases merino wool’s natural performance characteristics
Quick Drying
5x faster drying by pulling vapor away from the body to kickstart the drying process
Durability
8.8x more durable than traditionally spun merino fabrics
Temperature regulating
The wool fiber structure naturally keeps you cool in the heat & warm in the cold
Moisture Wicking
Merino wool moves water vapor away from your skin
Odor Resistant
Wool fibers trap & neutralize bacteria allowing you to get multiple wears between washes
Ultralight
115 gsm open knit performance fabric powered by Nuyarn
Super Fine
Superfine 18.5 micron wool for soft next to skin feel
Performance merino blend
Increased temperature regulation, quick drying, zero cling
Unlocking Merino
Twist free yarn technology releases merino wool’s natural performance characteristics
Quick Drying
5x faster drying by pulling vapor away from the body to kickstart the drying process
Durability
8.8x more durable than traditionally spun merino fabrics
The running tank I've been looking for! I'm a complete merino wool convert and a lightweight tank is a staple run piece that I've been on the hunt for. Courser tank checks all the boxes and I love the color/texture look of the fabric as well. I've had mine more than a couple months, have worn it a ton, raced in it and have washed it once. I love wool.
My first time wearing the courser tank was a hike/trail run in Sedona! It was a hot morning (90+) and it felt extremely light and comfortable-- almost like I wasn't even running in anything. One of the main things I noticed was how It didn't get heavy from all my sweat in the high temps. Plus I loved the color and fit. Highly recommend!
Absolutely love my Courser Tank! It's incredibly comfortable, lightweight, and has held up great on runs. As a self-identified heavy sweater, it's been so refreshing to find a shirt that doesn't stretch out throughout the run! So much thought went into the design and quality of this brand, highly recommend. (P.S. I still haven't washed it after several runs and it doesn't smell at all. I think this is magic).
Disclosure: Unknown Runner is owned by my son, but my opinion comes from more than 50 years as a runner. At 73, I still run regularly and have worn virtually every type of running fabric. These merino wool singlets and shirts are unlike anything I’ve worn—feather-light, incredibly soft, breathable, and they fit beautifully without the cling of synthetics. The colors are lovely, the sizing is accurate, and the odor resistance is remarkable. After sweaty runs, I hang them to dry and wear them again and again. They continue to look, feel, and fit like new.
New favorite running shirt!!!
Will be purchasing more!
Love this shirt. Light, dries fast, comfortable, and cute. I don’t run but wear it for sand volleyball and it’s the perfect shirt for that!
