We’re excited to launch our new Made In USA 100% Cotton Gym Short — designed for running, hiking, strength training, and lounging. Introducing the Pump-You-Up™ 7” Sweatshorts, a premium natural fiber gym short engineered with the gym (and real athletes) in mind.
Natural Fiber Workout Shorts

Meet the Runyon Pump-You-Up™ 7” Sweatshorts — a modern update to the American classic sweatshort and one of our most popular natural fiber workout shorts. With the signature Runyon pocket profile, these cotton workout shorts deliver everything you want from a natural-fiber training piece.

Crafted from USA-made French Terry, these shorts offer the breathable performance athletes love: durable enough for weights, soft enough for recovery days, and comfortable enough to wear commando around town. If you’re searching for cotton training shorts or non-spandex athletic shorts, these check every box.
Our Most Versatile Short
What sets this style apart is its versatility. The Pump-You-Up Sweatshorts are built for a wide range of activities — sweatshorts for running, sweatshorts for the gym, sweatshorts for hiking, and sweatshorts for everyday wear. They’re a true multi-use natural fiber gym short designed to handle whatever you throw at them.
Sweatshorts for Running

While originally designed for the gym, these quickly became one of our favorite sweatshorts for running — ideal for those cool weather easy 6–10 mile days. The stash pockets make it easy to carry a water bottle, lightweight running shell, or Tech Trail Hoodie when you remove layers.


As cotton running shorts, they excel in cool-to-mild weather thanks to their breathable, temperature-regulating French Terry fabric. The popular 7” inseam offers the perfect stride length with deep side pockets for all types of essentials. Pair them with the SupraPlush Boxer Brief, tighten the paracord drawcord, and head out the door.

Sweatshorts for the Gym

These are standout sweatshorts for the gym, designed to solve a major frustration for athletes — phones slipping out of pockets during lat pulldowns, bench press, or even while sitting in the car. The dual stash pockets fit a 20 ounce (650 ml) cycling water bottle or a workout towel with ease.

Built for lifters and hybrid athletes, these cotton workout shorts stay structured and supportive for strength training, HIIT, and conditioning work. The heavyweight French Terry provides durability and natural comfort rarely found in synthetic gym shorts.
Sweatshorts for Hiking

For hiking, camping, and casual outdoor adventures, these shorts pair perfectly with a Runyon Camp Shirt for a clean, outdoorsy look. For a full cotton hiking shorts setup, pair them with our Warm-It-Up Pullover Hoodie.


The breathable French Terry fabric is ideal for airflow during long trail days. Deep stash pockets give you easy storage for quick-grab items like snacks, maps, or your phone. They’re the ultimate natural fiber hiking shorts for comfort and versatility.

Sweatshorts for Yoga, Pilates & Mobility Training
If you’re looking for natural-fiber yoga shorts that move with your body — not against it — these 100% cotton sweatshorts are a game-changer. Unlike synthetic yoga shorts that can feel slick or restrictive, these cotton gym shorts for yoga and Pilates offer a grounded, stable feel that supports deep stretches, balance work, and breath-driven movement. The flexible waistband, soft French-terry interior, and naturally breathable fabric make them ideal for mobility training, warm-ups, restorative sessions, mat flows, and anything that requires smooth, unrestricted motion. Because cotton has zero static and no plasticky feel, these cotton blend mobility shorts help you stay focused and fully connected to your flow — whether you’re holding a long plank, shifting into Warrior II, or moving through a Pilates sequence. If you want comfortable yoga shorts made from natural fibers, these sweatshorts are an unmatched everyday essential.
Sweatshorts for Lounging & Everyday Wear
Thanks to their clean athletic design, these double as premium cotton lounge shorts. They’re comfortable enough for rest days and stylish enough for running errands or meeting friends. A go-to pick for those seeking everyday cotton shorts for men with a modern athletic fit.
About the Pump-You-Up 7” Sweatshort
Made from USA-milled 100% cotton French Terry, these natural fiber gym shorts are engineered for athletes who want breathable, non-spandex gym shorts that keep things simple and functional. If you’re searching for cotton training shorts, cotton gym shorts, or gym shorts without synthetics, this pair delivers reliable airflow, durability, and natural moisture absorption.
They’re available in Black, Sage, and Navy, with an additional French Terry Tri-Blend (50% Cotton, 40% Polyester, 10% Rayon) option in Heather Grey for those who prefer slightly more moisture-wicking performance.
It’s Time to Start Wearing Cotton Again
French Terry has been a heritage training fabric for decades. Its loopback interior naturally pulls moisture from the skin, providing old-school wicking and cooling benefits that synthetic fabrics can’t replicate. By choosing 100% cotton gym shorts over woven performance textiles, you not only enjoy superior comfort and breathability but also help reduce reliance on imported fabrics and directly support American manufacturing — from the USA-milled French Terry to the handcrafted construction in Los Angeles.
For athletes seeking natural fiber workout shorts or cotton-based gym shorts, there’s no better fabric. These shorts deliver exceptional softness, natural airflow, and all-day comfort — perfect for running, strength training, conditioning, hiking, or everyday wear. Choosing cotton isn’t just a performance decision; it’s a conscious choice to invest in quality, durability, and American-made craftsmanship.
Made for All Sexes
The Pump-You-Up™ 7” Sweatshorts are designed as a unisex style, offering the same comfortable, natural-fiber fit for everyone. Women can enjoy the same cotton gym shorts for running, yoga, or lounging — we recommend sizing up if you prefer extra room for larger hips, or referring to the size chart on the product page to compare dimensions with your favorite pair of shorts at home. This versatile design ensures everyone can enjoy natural fiber workout shorts with the same athletic, clean silhouette and reliable comfort.
All In The Details + Original Design
To solve the frustration of phones falling out during workouts, we created our patented dual outside stash pockets. These pockets secure your phone, wallet, keys, towel, or water bottle without shifting or slipping.
Designed for function and everyday style, these shorts also include:
Key Features
- Dual Outside Stash Pockets — Prevent slippage; fit a phone, water bottle, towel & more
- Natural-Fiber, 100% Cotton Workout Shorts — Perfect for athletes who prefer breathable cotton gym shorts
- USA-Grown & Milled French Terry Cotton — Durable, soft, moisture-wicking, and natural
- Designed & Tested by Endurance Athletes
- Handcrafted in Los Angeles
- Rugged Paracord Drawcord
- 7-Inch Inseam — Athletic and versatile
- Not Pre-Shrunk — Designed to shrink to a perfect fit after the first wash
- Reinforced Polyester Pocket Lining — Non-skin-touching and built for longevity
Available in 4 Colors
The Pump-You-Up™ 100% Cotton Gym Shorts are available in four versatile, natural-inspired colors designed to fit every workout style: Black Pine, Sierra Sage, Vintage Navy, and Mineral Grey. Each shade pairs easily our Tech Trail Tanks, Trail Shirts, Camp Shirts, Tech Trail Hoodies, Pullover Hoodie Sweatshirts making these sweatshorts perfect for running, gym workouts, yoga, hiking, and everyday lounging. Whether you prefer bold contrast or subtle earth tones, there’s a color that matches your routine and your personal style.
Black Pine
Our Black Pine sweatshorts offer a rich, deep charcoal-green tone that looks sleek in both gym settings and outdoor runs. The color hides sweat, pairs well with any neutral top, and photographs beautifully thanks to its modern, athletic feel. It’s the perfect go-to shade if you want natural fiber gym shorts that still look elevated and tough enough for daily training.
Sierra Sage
Sierra Sage (Olive Drab) is a fresh, calming green that fits the natural-fiber aesthetic perfectly. Ideal for yoga, mobility sessions, or relaxed weekend hikes, this color shows off texture and stitching exceptionally well in photos. The soft, earthy tone also works great for lifestyle shots, making it a top choice for anyone who wants cotton gym shorts with a clean, minimalist look.
Vintage Navy
Vintage Navy delivers a classic athletic vibe with a subtle retro undertone. This color highlights the short’s American-made craftsmanship and looks sharp in motion — whether you’re running sprints, lifting, or stretching on the mat. Vintage Navy is especially photogenic outdoors, making it an easy pick for showcasing the shorts in action.
Mineral Grey
Mineral Grey (Heather Grey) is a versatile, everyday neutral that complements almost any outfit. The color emphasizes the fabric’s texture and silhouette, making it ideal for close-up shots and lifestyle photos. Lightweight-looking but bold in tone, Mineral Grey is the perfect choice if you’re aiming for a clean, modern aesthetic with your natural-fiber workout shorts.




























































































