What are the weights in weighted clothing made of?

It depends on the brand. OMORPHO says its built-in weights are polyurethane, and Tom's Guide describes them as high-density polymer spheres. KILOGEAR's removable inserts are a steel composite with a rubber cover, and Challenge Weighted Workoutwear uses removable elastomer Weight Thins.

Can you return weighted clothing if it doesn't fit?

Policies differ. OMORPHO lists free returns and a 30-day money-back guarantee. KILOGEAR says US returns are exchange-only, and its FAQ gives a 14-day exchange window while its product pages say within 30 days of delivery. Challenge Weighted Workoutwear's leggings page gives no returns or warranty information.

Is weighted clothing HSA/FSA eligible?

OMORPHO says its G-Wear garments and vests are HSA/FSA eligible, and its G-Short page repeats this. The KILOGEAR and Challenge Weighted Workoutwear pages we checked do not say.

Weighted Clothing & Weight Jackets: Do They Work?

Weighted clothing (shirts, shorts and tights with small weights sewn in or slotted into pockets) adds only about 1 to 4 pounds, far less than a weighted vest. It suits people who want a little extra load during normal training. For walking or bodyweight strength work, an adjustable vest gives more load for less money.

What are the different types of weighted clothing?

There are two main types: garments with small weights built into the fabric, and garments with hidden pockets for removable weights. Weighted vests are the heavier alternative.

Type	How weight is added	Typical load	Examples
Built-in micro-load	Hundreds of small polyurethane spheres fused to the fabric	0.6–2.7 lb per garment	OMORPHO G-Top, G-Tank, G-Short, G-Tight
Removable pocket weights	Steel-composite or elastomer inserts in hidden pockets	Up to 1.5 lb (tee), 2.5 lb (leggings), 4 lb (shorts)	KILOGEAR APEX, Challenge Weighted Workoutwear leggings
Weighted vest (alternative)	Weights carried on the trunk, usually adjustable	3–20 lb in OMORPHO’s G-Vest line	Hyperwear Hyper Vest, OMORPHO G-Vest

Built-in weights. Inverse reports that OMORPHO spreads its spheres over the front, back and sleeves, with smaller ones at the upper chest, larger ones toward the bottom, and none on the shoulders and elbows.

Removable weights. KILOGEAR uses 0.25 lb KILOMICRO inserts for the upper body and 0.50 lb KILOMAX inserts for the lower body, made of a steel composite with a rubber cover. Challenge Weighted Workoutwear uses removable elastomer Weight Thins.

Clothing vs. vest load. In a 2024 Scientific Reports meta-analysis, loads attached to the limbs or trunk (“wearable resistance”) ranged from 0.55% to 5% of body mass, while vest loads ranged from 7% to 40%.

Weighted hoodies and jackets. Weighted hoodies sold in the US are mostly sensory products, not training gear. Walmart lists many “weighted hoodie for anxiety” items, such as this JUUYY hoodie, but we could not verify their weight specs. We found no fitness weighted jacket or hoodie for sale on OMORPHO’s shop page or KILOGEAR’s men’s listing on October 8, 2026. Garage Gym Reviews mentions an OMORPHO jacket, which we could not verify.

What is a heavy weight jacket?

In fashion, a “heavyweight” jacket means thick fabric, not a training weight. The term describes fabric density; one print-on-demand guide from Merchize sets the bar for T-shirts at over 180 grams per square meter. We found no authoritative definition of “heavyweight jacket” itself.

If you want a weighted jacket for training, the practical option is a weighted vest worn under or over a jacket. OMORPHO markets its G-Top LS2 as a layer to wear over its G-Vest.

How does weighted clothing work?

Weighted clothing spreads a small load across the torso and limbs, so every movement carries slightly more mass.

Because the load is spread out, garments stay light. OMORPHO’s homepage lists G-Wear at 1–2 lb for men and 0.5–2 lb for women, compared with 5–20 lb and 3–12 lb for its G-Vest. The G-Top Short Sleeve page says the shirt adds “1 to 2 lbs of MicroLoad™ resistance across your torso.” The G-Short 2-in-1 places its weight across the thighs.

A 2017 systematic review in Sports Medicine found that limb loads of 0.3–8.5% of body mass raised oxygen use and energy cost in walking and running and lowered sprint velocity. These were short-term lab effects, not tests of retail garments.

Does training with weighted clothing work?

The evidence is thin: one small study tested a weighted shirt, and wearable-resistance research covers mostly young athletes and performance outcomes only.

The weighted-shirt study. In an ACE-sponsored study at UW–La Crosse, 16 healthy college-aged exercisers walked, ran and stepped in an 8 lb TITIN shirt (about 4.9% of body weight) and in an unweighted compression shirt. Oxygen use and calorie burn rose by an average of 7% (about 13% for stepping), or 0.3 to 1.2 kcal per minute. The authors called the effect modest; more would require heavier loads they considered possibly unsafe. The study was acute, small and industry-funded; we could not verify that the shirt is still sold.

Wearable-resistance reviews.

The 2017 Sports Medicine review of 32 studies called the research “still clearly in its infancy.”
The 2024 Scientific Reports meta-analysis (25 studies) found both wearable resistance and vests slowed sprints acutely, and “no supporting evidence” that either improves sprinting over time, based on only five long-term studies.
A 2025 Frontiers in Physiology meta-analysis of 10 trials, mostly in male team-sport athletes, found a small sprint gain (best with trunk loads of 10% of body mass or less) and no significant jump gain, at low certainty.
A 2026 PeerJ meta-analysis of 19 trials, mostly in young male athletes, found better jump power and agility but no significant change in maximal strength or speed; possible publication bias limits it.

What’s missing. We found no peer-reviewed long-term trial of a commercial micro-loaded garment, such as OMORPHO or KILOGEAR, on fat loss, bone or other health outcomes.

Maker claims. OMORPHO’s blog claims +8% power, +3% speed, +9% jump and +8% calorie burn, and KILOGEAR’s homepage claims up to 43% more calories burned. Neither is backed by a study we could find. On the other side, vest maker Hyperwear argues that micro-load clothing at about 1% of body weight is weaker than vests at about 10%; as a vest seller, it is not neutral. Garage Gym Reviews founder Coop, who tested OMORPHO clothing, doubts the strength of the science behind microloading.

Weighted clothing vs. weighted vest

A vest is the better tool for meaningful, adjustable load; clothing makes sense only if you want a very light load spread over your body.

Factor	Weighted clothing	Adjustable weighted vest
Load range	About 0.6–4 lb per garment	Much higher; OMORPHO’s G-Vest alone goes up to 20 lb
Adjustability	None (built-in) or small steps with pocket inserts	Removable weights, usually adjustable
Cost per pound	High	Much lower, especially for adjustable vests
Visibility	OMORPHO spheres can look studded; KILOGEAR pocket weights are hidden	Visible training gear, though compression-fit vests sit close
Washing	OMORPHO: machine washable; pocket garments: remove weights first	OMORPHO G-Vest: no washer or dryer, spot clean or hand wash
Best use	A little extra load during normal training	Walking, bodyweight strength work, progressive loading

Most garments sit in the $$ band (75–150 US dollars) for 0.6–4 lb. Hyperwear estimates that adjustable vests cost far less per pound than both garments and fixed-weight vests, though it is a vest seller.

Vests can also fit closely. BarBend, which tested the compression-fit Hyperwear Hyper Vest Elite for its best weighted vests guide, says it “almost feels like you’re wearing your favorite training shirt.” For options, see our best weighted vests and how adjustable vests work.

Weighted clothing on the market

Three makers sold fitness weighted clothing in the US from their own sites when we checked on October 8, 2026. Price bands: $ is under 75, $$ is 75–150, $$$ is 150–250 US dollars.

OMORPHO G-Wear (built-in weights)

OMORPHO’s built-in line includes the men’s G-Top Short Sleeve (1.6 lb), men’s G-Top Long Sleeve (1.3 lb), women’s G-Tank (0.6 lb), G-Short 2-in-1 (1.5 lb), men’s G-Base Shorts (1 lb) and women’s G-Tight (0.7–2.7 lb), all in the $$ band. An optional G-Pack ($ band) adds 2 lb of removable panels to the G-Tight. Garments are machine washable.

Weights conflict across sources:

G-Top Short Sleeve: OMORPHO lists 1.6 lb, the Garage Gym Reviews product listing gives 1.10 lb, and WearTesters measured 1 lb 10 oz on a 2021 version.
G-Top Long Sleeve: the LS2 page says just over one pound, the shop page 1.3 lb and older coverage over 2 lb; we could not verify why.

What reviewers say:

Garage Gym Reviews (hands-on, founder Coop): 4.2/5, praising comfort and even weight spread but faulting price, limited weight and no adjustability: “Do I like and recommend it? It depends.”
WearTesters (hands-on, G-Top SS and G-Short): 9/10, describing the weight as “pushing against my natural motions just enough.” Downsides: chafing, short shirts, price.
Tom’s Guide (hands-on, G-Tight, Editor’s Choice): “The added poundage definitely makes any fitness activity more challenging.” Downsides: price, ankle gaping, beads pressing into skin in arm balances.
Gear Patrol (hands-on, leggings and bike shorts): “the weight forced me to push a little harder throughout my routine.”
Trail Runner (free sample, tested by the writer’s brother): “the concept is awesome,” with an unusual look and modest weight as downsides.

KILOGEAR APEX (removable weights)

KILOGEAR sells tees, polos, shorts and tights with hidden pockets; the weights are sold separately. The APEX Pro Tee has six bicep pockets and a 1.5 lb maximum load, in sizes XS–4XL; the same page also says it holds up to four weights, which conflicts. It sits in the $$ band with or without the full weight set. The APEX Pro Quad Short takes up to 4 lb and reaches the $$$ band with the full load. KILOGEAR offers a six-month warranty against defects.

Challenge Weighted Workoutwear leggings (removable weights)

The Women’s Weighted Leggings ($$) come with 10 Weight Thins totaling 2.5 lb in side pockets, in sizes XS–XL and black only. The page gives no returns or warranty information.

Some brands that appear in older reviews are no longer available from their own sites, so we do not list them.

Can you run in weighted clothing?

Studies show small effects on sprint stride, but there is no injury data, and our house guidance does not recommend running with added load by default.

Sprint studies typically use limb loads of about 1–5% of body mass, most often 2%. In 11 male athletes sprinting about 50 m with 2% of body mass on the thigh or shank:

An ISBS 2018 paper found no significant change in sprint times; shank loading cut step frequency by about 2–2.5% and lengthened ground contact time.
A 2021 Journal of Sports Sciences paper found sprint times and top speed changed by 0–1.9% with thigh loads and 1.6–3.3% with shank loads, with larger braking impulses from shank loading.

Reviewer reports (Gear Patrol’s uphill runs, Trail Runner’s 1–3 hour runs) are anecdotal. See running with a weighted vest.

How much should weighted clothing weigh?

Most garments weigh 0.6 to 4 lb; OMORPHO suggests about 1–2% of body weight, which is maker guidance, not a study-based figure.

OMORPHO: roughly 1.7–3.4 lb for a 170 lb person. After two to four weeks, it suggests adding a G-Vest to reach about 4–6%.
KILOGEAR: gives no number. It suggests starting with a partial load, moving to a full load, and says a light load worn consistently beats a heavy one worn briefly.

Gear Patrol’s full OMORPHO kit, including a large G-Vest, came to about 15 lb.

For vests, our house guidance starts around 5% of body weight; see how heavy a weighted vest should be.

How to choose and care for weighted clothing

Check fit, weight type, washing, looks and the return policy.

Fit. OMORPHO recommends sizing down on the G-Tight for a compression fit. WearTesters reported chafing tops and short shirts and suggests an undershirt; Garage Gym Reviews’ listing notes some customer reports of chafing. Tom’s Guide found that inseam length decides where the weights sit relative to the knee.

Built-in vs. removable. Built-in weights cannot be adjusted; pocket weights let you add load in small steps.

Washing. OMORPHO garments go in the machine with nothing to remove; the LS2 page says turn it inside out, wash warm and tumble dry low. Tom’s Guide washed and dried the G-Tight several times without losing beads. For KILOGEAR, remove the weights, wash cold and inside out without softener, and spot clean the weights only. Challenge also says to remove all weights first. See our guide on how to clean a weighted vest.

Visibility. Inverse says OMORPHO’s spheres sit on the outside, giving a studded look, while the current product page says the weights lie flat on the inside. Trail Runner calls the look unusual. KILOGEAR’s pocket weights are hidden.

Returns and warranty. OMORPHO offers free returns and a 30-day money-back guarantee; its homepage states no warranty. KILOGEAR’s US returns are exchange-only; its FAQ says 14 days, its product pages 30.

Weighted Clothing & Weight Jackets: What Works