FORTEC's Speed Charge water bottle cover is made of durable nylon material. - Brand: FORTEC - Model Name: Speed Charge - Colors: Black/Yellow - Inner Material: Nylon - Size: 1L - Application: Water bottle cover Thank you for viewing. Please be sure to read the profile. This is cover model number RH1558, with a bottom diameter of 8cm and a height of 24cm. I plan to send it via postal mail.