Made of polyester.
 
Measurements:
XS: Chest of 53 cm across front when lain flat; Length 61 cm
S:  Chest of 55 cm across front when lain flat; Length 63 cm
M:  Chest of 57 cm across front when lain flat; Length 64 cm
L:  Chest of 60 cm across front when lain flat; Length 65 cm
XL: Chest of 63 cm across front when lain flat; Length 67 cm