Joined: Jul 2002
Posts: 40,863
Likes: 3,116
From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
You might need a women's XS, depending on the brand and how you like the fit. Most of the U-11 boys on my son's junior team ordered women's stuff from Castelli.