Size Guide

Most BJJ sizing is two letters and a number: a kimono cut for body shape, plus a stretch panel that decides how the gi behaves on day one. Use the chart that matches the piece, then read the notes — they're the bit suppliers usually skip.

Gi sizing — adults (A-cut)

IBJJF-legal A-cut sizing. Measurements are the wearer's height and walk-around weight, not the gi's. If you sit between two sizes, size down for guard players and up for top-pressure passers — A-cut runs long in the sleeve.

Size	Height	Weight	Best fit
A0	155–165 cm	50–60 kg	Light featherweight, junior crossover
A1	165–172 cm	60–70 kg	Featherweight to light
A2	172–180 cm	70–82 kg	Middle to medium-heavy — most common cut
A3	180–188 cm	82–95 kg	Medium-heavy to heavy
A4	188–195 cm	95–108 kg	Heavy to super-heavy
A5	193–200 cm	108–125 kg	Super-heavy and ultra-heavy
A6	200 cm+	125 kg+	Ultra-heavy, special-order

Pre-shrink notes

All Roll Society pearl-weave gis arrive pre-shrunk. Cold wash on a delicate cycle, hang-dry, no tumble — and an A2 stays an A2. Hot wash + tumble dry will pull the body in roughly half a size; that's on the laundry, not the gi.

No-Gi (rash guards & spats)

No-gi sizes are based on chest girth (rash guards) and waist+inseam (spats). Compression should feel like a firm hand on the shoulder — not crushing, not loose. If you can pinch more than 2 cm of fabric, size down.

Size	Chest	Waist	Height
XS	86–92 cm	71–76 cm	160–168 cm
S	92–98 cm	76–81 cm	168–175 cm
M	98–105 cm	81–87 cm	173–180 cm
L	105–112 cm	87–94 cm	178–185 cm
XL	112–120 cm	94–102 cm	183–190 cm
XXL	120–128 cm	102–110 cm	185–195 cm

Belts

Belt sizing is by total length, not by waist. Wrap the belt twice and knot — the working ends should hang 12–18 cm past the knot when tied for sparring. Buying a length under your gi size traps the knot too tight at the waist; over your size, the ends flap into the open guard.

Belt size	Length	Pairs with gi
A0	240 cm	A0–A1
A1	260 cm	A1–A2
A2	280 cm	A2 (most common)
A3	300 cm	A3
A4	320 cm	A4–A5

Rank stripe placement

Black tip goes on the right hand of the wearer when worn. Stripes are applied to the black tip in the order earned. Fresh promotion belts ship blank — your professor decides when the stripes go on.

Kids & youth

Kids gis run on M-codes (M0–M4) tied to height and age, not weight — most kids' weight is too inconsistent to size by. If you're buying for a fast-growing kid mid-stripe, size up one M and roll the cuffs once for the first six months.

Size	Height	Approx age
M0	105–115 cm	4–5 yr
M1	115–125 cm	5–7 yr
M2	125–135 cm	7–9 yr
M3	135–145 cm	9–11 yr
M4	145–155 cm	11–13 yr

Still on the fence

Tell us your height, weight, and what you actually want the gi to do on the mat — we'll size it. Drop a note via contact with those three details and we'll write back the same day.