Rider-matched picks
Size-matched gloves picks for teenagers (ages 12–16), with fit and feature priorities curated for how teenagers (ages 12–16) actually ride.
Verified on Amazon today — prices and availability may vary.

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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Teenagers occupy the most complex sizing zone in cycling — they're transitioning from wheel-diameter-based kids sizing to frame-size-based adult sizing. A teen's height at 12 may be vastly different from their height at 16, making growth prediction an important factor. Shorter teens (148–160 cm) typically fit 26" wheel youth bikes or adult XS frames. Mid-range teens (160–170 cm) can fit adult S frames in most brands. Taller teens (170–180 cm) fit standard adult S or M frames. The key difference from adult sizing is proportion — teens often have relatively longer legs and shorter torsos compared to adults of the same height, which means they may need a frame one size smaller than the height chart suggests, or a stem adjustment to shorten the reach. At this age, teens should be sized using the same methods as adults: stack and reach measurements, saddle height calculation (inseam × 0.883 for pedal-to-saddle distance), and test rides.
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.