Size chart reference Size 4-5, suit for kids ,weight from 13-16kg, waist 23*2cm,Hip 25cm,Crtoch 18cm. Length17cm Size 6-8, suit for kids ,weight from 16-21kg, waist 25*2cm,Hip 28cm,Crtoch 19cm. Length18cm Size 9-10, suit for kids ,weight from 21-25kg, waist 27*2cm,Hip 30cm,Crtoch 20cm. Length19cm Size 10-12, suit for kids ,weight from 25-30kg, waist 29*2cm,Hip 32cm,Crtoch 22.5cm.Length 20cm Size 12-14, suit for kids ,weight from 31-37kg, waist 31*2cm,Hip 34cm,Crtoch 22.5cm.Length 21cm Size 14-16, suit for kids ,weight from 38-49kg, waist 33*2cm,Hip 36cm,Crtoch 23.5cm.Length 22cm Size 16-18, suit for kids ,weight from 49-62kg, waist 35*2cm,Hip 38cm,Crtoch 25.0cm.Length 23cm Boys boxer shorts 95% Cotton 5% Spandex; Antiallergic! Breathable and respectful of children's skin. The elastic waistband is very flexible and is reinforced at the edge to prevent deformation. Super smooth seams elasticated waistband added comfort 5 pack of boys' underwear in assorted colour prints Size from llittle Boys to big boys for age 2 to 18 years; This boxer brief is slim fit, for loose fit, pls pick one size up Simple design: Straight cut boxer shorts in cotton, ideal for everyday wear for little ones.