About These Tanks
Breathable Build, All-Day Ease
Mindful Materials, Minimal Design
Frequently Asked Questions
You've got questions, we've got answers
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Move with ease in Sustain Tanks designed for studio sessions, travel, and everyday layering. A clean athletic cut, breathable comfort, and lightweight feel keep you centered on and off the mat. The fabric sits smoothly against skin so you can focus on form, breath, and flow.
A refined silhouette sits smoothly over shorts or joggers and will not ride up during flow. The armholes and neckline are shaped for mobility so you can move freely through warmups, peak poses, and cooldowns. Subtle detailing keeps the look minimal while supporting confident movement.
Lightweight, quick-drying comfort helps regulate temperature from class to commute. Soft against skin and easy to layer, these tanks transition seamlessly from practice to daily wear. The fabric dries quickly after intense sessions so you stay comfortable longer.
Crafted with eco-conscious materials and durable construction, Sustain Tanks hold their shape and color over time. The minimalist aesthetic makes them simple to style across your active wardrobe. Fewer distractions and thoughtful finishes make them a go-to layer every week.
You've got questions, we've got answers
Yes. The breathable build and athletic cut support full range of motion for yoga flows, cross-training, and recovery days. The fit stays close without restricting movement.
Absolutely. The streamlined profile sits clean under mid-layers without bulk, ideal for warmups and cooler mornings. It also pairs well with lightweight outerwear after class.
They are form-following without feeling tight, with comfortable stretch that stays put through movement. Choose your usual size for a close, athletic feel.
Yes. Sustain Tanks prioritize responsible materials and long-wearing construction for lower-impact performance, season after season.
Yes. The tank is designed to retain structure and softness through repeated wear and washes, helping it look fresh longer.
Pair a Sustain Tank with 4-rth joggers or eco track shorts for a balanced studio-ready outfit, then add a lightweight layer for the commute.
Great color yellow. Just a bright tank top a real head turner
Just about the nicest shorts I've ever owned. Shape, cut, styling, all very cute... not to mention how hard it is to find menswear in the Purple color range. Lovely dark shade of plum, quite soft, comfortable, and stretchy. Also, sizing advice is spot on. Very happy with these shorts.
I have three pairs of these pants and love them. I can move very freely. I also love the fabric being Polyester free and the length is very helpful for providing traction during arm balances.
These are my favorite hot yoga shorts. Super comfortable and allow for great movement.
Finally located my go-to lounge pants. Quality construction, slim profile, characterful touches like the cuff design, ideal fabric weight, stretchy waist, and the major one: the *IDEAL* length to attractively accommodate my 5' 6" frame sans excess fabric... because a dude wants to show some leg, y'know? Love these things. I own them in two colors - cinnabar red & the lovely light cloudy grey, which I prefer to the more common dark charcoal greys. To nitpick, the zippers could be higher quality and not boring black, such as a more substantial YKK with perhaps an aged nickel patina. That is the single attribute that I could envision to be upgraded in a future iteration. Still, I am so pleased with these as everyday lounge/walking pants than I cannot bother reducing a star.
I just ordered 3 more of these after my first 3 I ordered finally had to be discarded after about 4 years of constant use. Best shorts ever and only shorts I buy and wear!
Amazingly comfortable and fantastic customer service
These yoga and workout pants are perfect for me. Comfortable, conforming,and stylish and functional. Nice material and construction. These pants have a lot going for them. The make me happy when I have them on.
I love these sweat pants. They are super comfortable and very well made.
I mainly wear a small when wearing 4-rth clothing. However, I wanted a more loose and casual fit so I got these in a medium for house lounging…. I love them, they are super comfortable and very well made.
Excellent for hot yoga. Very pleased with the fit and performance.
I just received two pairs of the ultra flex and love them! The fit is great and I really love your company!
These cuffed yoga pants are great! I liked them so much I ordered two more.. for reference I am 5’9/160 lbs… the small works great for my frame.
These feel so good to the skin. The fit is correct and they look great. Might be my favorite pair of sweats. I bought 7 more pairs and cant wait to receive them!
These are comfortable and cool all rolled into one. Great for kicking it back at home or any casual event. Yoga. Running. There is no limit.
Absolutely love the fit and feel.
These are hands down the most comfortable and attractive shorts I’ve ever owned. I’ve never gotten as many compliments about an article of clothing before (all from women, fwiw). I have these in three different colors but these seem to get the most positive feedback. I’ve worn them to the beach (even swam in them), to the grocery store, to Pilates. Had to get up my nerve to go all white in public (with no underwear) but it was totally rewarding. They’re the best.
Great color yellow. Just a bright tank top a real head turner
Just about the nicest shorts I've ever owned. Shape, cut, styling, all very cute... not to mention how hard it is to find menswear in the Purple color range. Lovely dark shade of plum, quite soft, comfortable, and stretchy. Also, sizing advice is spot on. Very happy with these shorts.