• Lightweight & Soft Material - Our maternity leggings are made of 92% polyester and 8% spandex. This is a very soft, lightweight and breathable material, which can keep you warm and comfortable on the autumn or winter days. It is like the second skin, giving you a buttery soft and comfy wearing experience.
• Belly Support - Designed for pregnant mothers maternity leggings.  Gradually increasing abdominal circumference, high waist design, stretchy and comfortable.
• Sufficient Elasticity - 4 way elasticity gives you and your baby more room for movement and growth. a pair of maternity leggings can run through your entire pregnancy whether it is from the first trimester to the third trimester. 
• Two side pockets for phone, wallet, etc.

Size Medium says: 

Abdominal Circumference 30-36 inches