FOUNDATION HVWT SWEATPANT
Free Shipping and Returns
Couldn't load pickup availability
Description
Description
Built with intent, not excess. The Heavyweight Foundation Sweatpant is our take on a timeless staple—refined in fit, elevated in feel, and designed to move with you. Crafted from custom-developed Tanquis cotton french terry and finished for comfort with an elastic drawstring waistband, darted knees for ease of movement, thoughtfully placed pockets, and ribbed cuffs for a clean look. Part of our Foundation collection: timeless essentials, thoughtfully made.
Description
Description
Built with intent, not excess. The Heavyweight Foundation Sweatpant is our take on a timeless staple—refined in fit, elevated in feel, and designed to move with you. Crafted from custom-developed Tanquis cotton french terry and finished for comfort with an elastic drawstring waistband, darted knees for ease of movement, thoughtfully placed pockets, and ribbed cuffs for a clean look. Part of our Foundation collection: timeless essentials, thoughtfully made.
Fit
Fit
A modern, tailored fit with a clean taper and easy movement through the leg.
Fit
Fit
A modern, tailored fit with a clean taper and easy movement through the leg.
Fabric
Fabric
415 GSM organic Peruvian Tanquis cotton french terry with a substantial hand, breathable structure, and garment dyed finish.
Fabric
Fabric
415 GSM organic Peruvian Tanquis cotton french terry with a substantial hand, breathable structure, and garment dyed finish.

Size & Fit
Tops
| Size | Chest | Front Length | Waist | Sleeve | CB Length |
|---|---|---|---|---|---|
| S | 36-38" | 26.75" | 18.75" | 16.25" | 26" |
| M | 39-41" | 27.75" | 20.75" | 17" | 27" |
| L | 41-44" | 28.75" | 23.25" | 17.75" | 28" |
| XL | 45-47" | 29.75" | 26.25" | 18.5" | 29" |
| 2XL | 48-52" | 30.75" | 29.25" | 19.25" | 30" |
Bottoms
| Size | Waist | Hip | Thigh | Inseam |
|---|---|---|---|---|
| S | 28-30" | 35-37" | 25.50" | 9" |
| M | 32-34" | 38-39" | 26.75" | 9" |
| L | 35-38" | 41-43" | 28" | 9" |
| XL | 38-43" | 45-47" | 29.25" | 9" |
| 2XL | 43-47" | 48-50" | 30.50" | 9" |
All measurements are garment measurements laid flat. Chest and waist are measured across, not around. If you're between sizes, we recommend sizing up.
We don't design everything to fit the same. We design each piece to fit its purpose. Every silhouette is intentionally built for how it's meant to move, layer, and live.



Product fit reference
All product measurements on SMBL are garment measurements laid flat — not body measurements. If you're between sizes, we recommend sizing up. Questions? We'll size you right or we pay the return.
We made the Heavyweight Sweatpant to be a more refined take on an everyday essential. Something comfortable enough to live in, but considered enough to feel put together beyond just off-duty wear. We wanted it to feel familiar in function, then elevated everywhere else. A substantial fabric, a cleaner silhouette, and details that quietly improve how it moves and wears over time. Built with articulated knees, a comfortable waistband, and a tailored fit, it is a staple reworked with more intention. The Heavyweight Sweatpant is an everyday piece, elevated through material, function, and finish.
Every Heavyweight Sweatpant starts with 415 GSM 100% organic Peruvian Tanquis cotton french terry, chosen for its softness, structure, and substantial hand feel. Knit from long-staple yarns, the fabric wears comfortably, breathes well, and develops more character with time. Garment dyed for a lived-in feel from day one, it is grown, spun, and sewn entirely in Peru under GOTS-certified and Fair Trade standards. The result is a sweatpant that feels grounded, durable, and refined in everyday wear.
The Heavyweight Sweatpant is cut with a clean, tailored silhouette that feels easy on body while still looking considered. The 415 GSM french terry gives it a more substantial weight, while articulated knees add comfort and ease of movement throughout the day. An elastic drawstring waistband provides an adjustable fit, and the internal right-hand stash pocket adds utility without adding bulk. Finished with ribbed cuffs for a cleaner shape, it is built to feel comfortable, wear easily, and settle in over time.
I'm a big fan of these sweats. Love the bottom cuff design, which makes it easy to get into. Really soft and comfy, and I love the design details, like the small inner pocket in the right pocket.
Just got my first SMBL item. I bought a pair of the Foundation sweatpants and they don’t disappoint. They’re gonna be perfect for rides back home after a day of skiing or fishing out on the SF Bay. Great item.
These sweatpants are unreal. The material feels thick, rich, and built to last while still being incredibly comfortable. They have that perfect tailored look, relaxed without being sloppy, and they maintain their shape wash after wash. Whether I’m lounging, traveling, or running errands, these pants are my first choice every single time. They feel like the kind of premium gear you’re proud to wear.
Good fabric, not too heavy, not too thin. I washed first time on delicate and hung dry and there was considerable shrinkage. I'm in the XL's and I feel like they used a drawstring from a pair of mediums - almost useless. Still, love the cut and feel.
I really like these! The cut and fit are perfect for me. I usually wear a 33/32 pant and got a medium and they're dialed. They're heavy duty and feel thick, but I wore them outside yesterday in 95 degree heat for a bit and felt great.
-
-
Olive / S
-
Olive / M
-
Olive / L
-
Olive / XL
-
Olive / 2XL
-
Navy / S
-
Navy / M
-
Navy / L
-
Navy / XL
-
Navy / 2XL
-
Honey / S
-
Honey / M
-
Honey / L
-
Honey / XL
-
Honey / 2XL
Boardshorts
LUCID HYBRID SHORT
Regular price $139.00Regular priceUnit price / perSale price $139.00 -
-
-
Dark Clay / S
-
Dark Clay / M
-
Dark Clay / L
-
Dark Clay / XL
-
Dark Clay / 2XL
-
Bone / S
-
Bone / M
-
Bone / L
-
Bone / XL
-
Bone / 2XL
-
Storm Blue / S
-
Storm Blue / M
-
Storm Blue / L
-
Storm Blue / XL
-
Storm Blue / 2XL
-
-
-
Black / S
-
Black / M
-
Black / L
-
Black / XL
-
Black / 2XL
-
Gold / S
-
Gold / M
-
Gold / L
-
Gold / XL
-
Gold / 2XL
-
Bone / S
-
Bone / M
-
Bone / L
-
Bone / XL
-
Bone / 2XL
Cycling Apparel & Accessories
GLIDE SHIRT
Regular price $99.00Regular priceUnit price / perSale price $99.00 -
-
-
Olive / S
-
Olive / M
-
Olive / L
-
Olive / XL
-
Olive / 2XL
-
Black / S
-
Black / M
-
Black / L
-
Black / XL
-
Black / 2XL
Cycling Apparel & Accessories
FLYWHEEL MTB SHORT
Regular price $199.00Regular priceUnit price / perSale price $199.00 -