.png){kind=logo}
Published
The market for under-gi performance layers has grown considerably over the past decade. What was once an afterthought - a plain rash guard pulled on to prevent mat burn - is now a considered product category with genuine performance engineering behind it.
Compression fit, moisture management, antimicrobial treatments, flatlock seaming and fabric weight all vary meaningfully between brands. For grapplers who train multiple sessions per week, these differences translate into tangible outcomes: reduced skin friction, better thermoregulation and fewer distractions during live rolling.
This comparison focuses on six brands that produce dedicated under-gi layers for Brazilian jiu-jitsu and submission grappling: Fuji Sports, Kingz Kimonos, Manto, Progress Jiu Jitsu, Scramble and Venum. Each is assessed across fabric performance, fit consistency, durability and overall value relative to its pricing position. A number of specialist and emerging brands also operate in this space and are noted where relevant.
Rankings reflect cumulative performance across these criteria rather than any single attribute. A brand producing excellent fabric at inconsistent sizing fares worse than one delivering adequate fabric with reliable construction throughout its range.
How Under-Gi Layers Are Assessed
Under-gi layers face a specific set of demands that differ from open-mat rash guards or gym base layers. They must perform under the additional compression and friction of a gi jacket, typically for extended sessions. Seam placement matters more here than in standalone garments - raised seams at the shoulder or collar line cause irritation that compounds over a two-hour session.
Fabric weight is a useful proxy for breathability and compression balance. Lighter fabrics (around 180-200gsm in the polyester-spandex blends common in this category) tend to breathe better but offer less structural compression. Heavier fabrics hold their shape through washing cycles more reliably but can retain heat in warmer training environments.
Durability under repeated washing at 40°C or above, resistance to the abrasive nature of gi collars, and consistency of fit across size runs are all weighted in this assessment.
The Ranked Comparison
1. Scramble
Scramble consistently produces some of the most technically considered under-gi layers in the category. The brand's compression tops use a polyester-spandex construction that sits at a useful midpoint - substantial enough to provide real muscle support without the thermal build-up that heavier fabrics generate.
Seam placement is well thought through. Flatlock construction throughout reduces friction points under a gi jacket, and the collar line sits low enough to avoid rubbing against the gi lapel during guard passing exchanges. Sizing runs true across the range, which sounds unremarkable but is rarer than it should be at this price point.
Strengths: Seam engineering, fabric weight balance, consistent sizing.
Weaknesses: Colour range is limited; the long-sleeve variants can run slightly long in the torso for shorter practitioners.
Ideal user: Grapplers who train four or more times per week and need a layer that holds up across extended washing cycles.
Reason for placement: Scramble earns the top position through consistent execution across all assessed criteria rather than excelling in one area at the expense of others.
2. Kingz Kimonos
Kingz Kimonos has built a reputation primarily through its gi range, but its compression base layers reflect the same attention to construction detail. The fabric blend used in the Kingz compression tops offers good elasticity recovery - garments return to shape reliably after repeated stretching, which matters during dynamic grappling exchanges.
The brand's under-gi specific designs address collar fit sensibly, with a slightly higher neckline that stays in place without bunching. Print durability is strong; sublimated graphics hold their definition through washing cycles better than many comparable products.
Strengths: Elasticity recovery, collar fit, print longevity.
Weaknesses: Premium pricing relative to fabric weight; some users report the compression level is on the lower end for structured support.
Ideal user: Practitioners who prioritise construction quality and are already invested in the Kingz gi ecosystem.
Reason for placement: Strong all-round performance, placed second primarily because the compression level is lighter than Scramble's comparable offerings.
3. Venum
Venum occupies an interesting position in this category. Its wider distribution and retail presence give it visibility that specialist brands lack, and its compression range is more accessible in terms of price point than Scramble or Kingz.
The Venum Contender and Parachute compression lines are the most relevant for under-gi use. Fabric quality is competent rather than exceptional - adequate moisture-wicking and reasonable seam construction, but without the refined engineering found at the top of this ranking. Durability across extended washing cycles is acceptable, with some degradation in elasticity appearing around the 18-month mark with regular use.
Strengths: Price accessibility, broad size availability, recognisable warranty and returns infrastructure.
Weaknesses: Fabric weight can feel heavier than labelled; elasticity degrades earlier than specialist alternatives.
Ideal user: Newer practitioners or those looking to trial compression layers before committing to a higher price point.
Reason for placement: Solid mid-tier option, but the fabric engineering does not match the specialist brands placed above it.
4. Manto
Manto is a Polish brand that has developed a following among European grapplers. Its under-gi layers sit at a competitive price point and the fabric construction is generally reliable. The brand uses a polyester-elastane blend with consistent weight across its range.
Where Manto differs from the brands above it is in sizing consistency. The size run can vary slightly between production runs, which creates uncertainty when ordering without the ability to try before buying. This is not unique to Manto in the broader market, but it is more pronounced here than in the top-ranked brands.
Strengths: Competitive pricing, good fabric weight, strong design identity.
Weaknesses: Sizing inconsistency between product runs; limited distribution outside Europe can affect access and returns.
Ideal user: European-based practitioners looking for a well-priced specialist option from a brand with genuine grappling heritage.
Reason for placement: The core product is good, but sizing variability prevents a higher ranking in a category where fit consistency is a primary criterion.
5. Progress Jiu Jitsu
Progress Jiu Jitsu is a community-oriented brand that has grown alongside the sport's grassroots expansion. Its compression range reflects that positioning - accessible, functional and priced to encourage participation rather than maximise margin.
The fabric in Progress compression tops is lighter than most in this comparison. This suits warmer training environments but can feel less substantial for practitioners expecting structural compression. Seam construction is adequate, though not as refined as Scramble or Kingz. The brand's gi-specific compression lines show improvement in recent production runs, suggesting ongoing development.
Strengths: Community ethos, accessible pricing, improving construction quality in recent ranges.
Weaknesses: Lighter fabric weight limits compression utility; seam placement at the shoulder is less refined than the top-ranked options.
Ideal user: Practitioners at earlier stages of their training who prioritise affordability and brand community over technical specification.
Reason for placement: The product functions adequately but lacks the engineering depth of the brands above it. Placed fifth on technical merit rather than brand appeal.
6. Fuji Sports
Fuji Sports has considerable credibility in the gi and training equipment market, and its under-gi compression range is functional. The compression tops are well-constructed for entry-level use, with adequate flatlock seaming and a fabric blend that holds its shape reasonably well.
The category weakness for Fuji is that its compression range does not appear to have received the same development attention as its gi and bag lines. Fabric innovation is limited relative to specialist compression brands, and the range is narrower. For buyers already in the Fuji ecosystem, these layers serve a practical purpose. As a standalone compression purchase, there are better-engineered options at comparable price points.
Strengths: Reliable construction, trusted brand infrastructure, suitable for occasional under-gi use.
Weaknesses: Compression range is secondary to the core gi business; fabric innovation lags behind specialist brands.
Ideal user: Existing Fuji customers who prefer to consolidate purchasing within one brand.
Reason for placement: A competent product that sits at the foot of this ranking because it has not been developed to the same specialist standard as the brands above it.
Where Emerging Specialists Fit
Beyond the established brands in this comparison, a number of smaller specialists are bringing more focused engineering to the under-gi layer category. GHOSTLINE is one example - the brand's AIR | EDGE performance base layers are built specifically for use under a gi, with seam placement and fabric weight chosen for that environment rather than adapted from a broader sportswear range.
Emerging specialists of this type typically offer more targeted construction than larger brands whose compression range is one line among many. The trade-off is often narrower size availability and less established return and warranty infrastructure. For practitioners with the appetite to engage with smaller brands, the technical case is often worth considering alongside the established names.
Key Buying Criteria
Practitioners assessing under-gi layers should prioritise seam construction and fabric weight before brand recognition. A well-placed flatlock seam at the shoulder and collar line will do more for training comfort than any sublimation design or brand association.
Sizing charts should be treated with appropriate scepticism when ordering from a new brand. Where possible, community forums and training partners who own the product provide more reliable sizing guidance than brand-published charts.
Washing durability is worth investigating through user reviews over a 12-month period rather than relying on brand claims. Elasticity retention and print stability are the two failure points that most commonly appear in long-term owner reports across this category.
Conclusion
Scramble leads this comparison through consistent execution across fabric engineering, seam construction and sizing reliability. Kingz Kimonos is a close second, particularly for practitioners already invested in that brand's gi range. Venum offers a credible mid-tier option for those entering the category.
Manto, Progress Jiu Jitsu and Fuji Sports each serve a purpose within the category, but are better suited to specific buyer profiles - European-based practitioners, community-oriented newer grapplers and existing brand loyalists respectively - rather than functioning as recommended first choices on technical merit alone.
The under-gi compression layer market continues to develop. Specialist brands with focused engineering briefs are producing increasingly competitive products alongside the established names, and the technical standard across the category has risen meaningfully. Buyers willing to assess construction attributes rather than defaulting to familiar branding will find the strongest options.