Kids · Girls'
Size-matched gloves for 12 year olds, with color and style notes typically preferred by girls in this age range. Fit remains the priority — pattern and color second.
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Diamondback
Adult half-finger glove sized by hand circumference — most riders fall in the M-L range.

Woom
Sized XS-XL by hand circumference. Multiple colorways available on the parent listing.
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Twelve-year-olds are transitioning into adult-sized bikes. Most children this age ride a kids 26" or an adult XS/S frame with 26" or 27.5" wheels. The deciding factors are height, leg length, and hand size. If your 12-year-old is over 150 cm and can comfortably reach adult brake levers and operate a standard drivetrain, an adult XS may be the better long-term investment. Under 150 cm, a kids 26" with shorter cranks and proportional components remains the safer choice. At this age, riders benefit from a full-featured drivetrain (1x10 or 1x11), quality disc brakes, and a bike matched to their riding discipline. Many 12-year-olds are riding to school, joining cycling clubs, and tackling real trails.
Measure hand circumference at the widest point across your palm, just below the knuckles, with the tape snug but not compressing the hand. Exclude the thumb. Most brands size: XS 6–7", S 7–7.5", M 7.5–8", L 8–9", XL 9–10". Italian brands (Castelli, Sportful) often run a half-size small; US brands (Giro, Pearl Izumi) size true. Kids gloves are usually sold by age band — XS (3–5 yrs), S (5–7), M (7–10), L (10–13) — but always cross-check against the brand's circumference chart because hand size varies more than age does.