size details: plz check before ordering:(cm) 

you could choose the size according to your kids height,for example,if your kids is 131-140 cm tall, then you could choose 10T--140 size.

                      Tail Length            Tail Hip          Tail Waist       Recommend height

4T(110):          100cm/39.4"         54cm/21.2"       42cm/ 16.5"         100-110cm Tall

6T(120):          105cm/41.3"         56cm/22"          46cm/18.1"          111-120cm Tall

8T(130):          110cm/43.3"         58cm/22.8"       48cm/18.9"          121-130cm Tall

10T(140):        115cm/45.3"         60cm/23.6"       50cm/19.7"          131-140cm Tall

12T(150):        120cm/47.2"         62cm/24.4"       52cm/20.5"          141-150cm Tall

• Perfect for summer surfing, beach holiday, bathing and swimming.
• Swimmable If you put a Monofin in the tail.
• Walkable because at the bottom of the mermaid tail is hollow out.
• The bottom of the mermaid tail can be Closed by Buttons.