All brand size guides

These are body measurements. Junior letter sizes should be checked against the age and height labels on the product.

Checked 10 November 2026 · UK sizing clearly labelled

Junior clothing

Junior clothing
Label / age Height (cm) Chest (cm) Waist (cm)
JS / 8–9 128–137 66–69 61.5–65
JM / 10–11 137–147 69–75 65–69
JL / 12–13 147–158 75–81.5 69–72.5
JXL / 14 158–170 81.5–88.5 72.5–75.5

Source: Castore published sizing information.

Before choosing your size

Clothing tables show body measurements unless stated otherwise. Keep the tape level and comfortably loose. Measure chest or bust at the fullest point, waist at the natural waist and hips at the fullest point.

For footwear, measure both feet while standing and use the longer foot. Only compare that measurement with a column explicitly labelled foot length. A CM, JP or JPN size label can mean something different. For socks, use the shoe-size range shown on the correct chart.

Age labels are approximate. Check height and measurements for junior clothing, and follow any fit advice on the individual product.

Need a hand? Contact Weekend Sports with the product name or code and your measurements.