Available sizes: 10 kid,11 kid,11.5 kid,12.5 kid,13 kid. New Balance Shoes (Trainers) 323. Available in boy's sizes. By New Balance. Put on your seatbelt: we are taking off for planet trendy with New Balance and these brand new trainers! Thanks to the red colour it is easy to mix with different styles. Do you dare try out this pair of trainers that defy the odds? So, what do you think? Product details: Sports shoe, Flat heel, Fastening: lace-up. Fabric content and care advice: Uppers: 100% other materials, Lining: 100% textile, Cushioning: 100% textile, Sole: 80% EVA, 20% rubber.