These convertible Footies is made with 85% Polyester and 15% Spandex. The fabric is a soft & silkier texture. These are double zipped and have the protected sleeve & feet coverings that folds over for your little munchkins who enjoy putting their little fingers into their mouths or if they have cold feet. 
 
Please do refer to the sizing chart for any any questions (full view of the size chart is on the quick view function).
 
Chest Measurements: (measured underneath the armit)
0-3M:  18 inches
3-6M: 20 inches
6-9M: 22 inches
9-12M: 24 inches
*Size chart is measured only on one side. The measurements above is for the front & back.