Steel Core Essentials Rashguard

Tool grey. Nothing else.

The STEEL Core Essentials Rash Guard is the neutral in the line — a no-gi compression layer in tempered grey that reads as equipment on any mat, under any gi, next to any team kit.

Why you’ll love it

• Locked-in compression — 280GSM four-way stretch blend holds position through inversions, shots, and scrambles. No riding up. No re-adjusting mid-roll.
• Goes with everything — grey is the one colourway that does not fight a team kit, an academy dress code, or the shorts you already own.
• Flatlock construction — every seam sits flat against the skin. Zero chafing across a two-hour session.
• Moisture discipline — rapid-wick fabric pulls sweat off the body and dries between rounds, keeping weight and cling minimal.
• Anti-microbial layer — engineered to resist the bacteria load of high-volume training.

Technical specifications

• Fabric: 280GSM compression blend — 85% polyester / 15% spandex
• Construction: Flatlock-stitched seams, reinforced stress points
• Graphics: Full sublimation — zero surface print
• Fit: Athletic compression. True to size. Size up for a relaxed fit.
• Ruleset: IBJJF no-gi compliant base colorway logic

Built for

The daily grind: no-gi jiu-jitsu, wrestling practice, MMA grappling rounds, and competition warm-ups. Wear it under a gi or as your primary no-gi layer.

Pairs with

The Steel Core Essentials Combat Shorts — matched kit, same standard. Buy the pair and the shorts come down 25%.

Sizing

• Adult: XS · S · M · L · XL
• Youth: XXS · XS · S · M · L · XL
• Athletic compression fit — true to size

The name

Steel is not the loudest metal. It is the one everything else is measured against — shaped by heat, finished without decoration, and trusted because it holds. Free from disturbance.

Composition & care

85% polyester, 15% spandex. Machine wash cold with like colors. Hang dry. No bleach, no fabric softener, no iron. Treat it like your technique — maintain it and it holds.