The warp cords are 3 mm cotton and form a strong linear geometry around which the thinner weft string is woven. The weft assumes a series of figure-8 shapes as it crosses over in the spaces between the warp cords creating the ribs.
The whole thing is made on a small loom after setting the size using a circular mold.
Buttons are secured with waxed nylon thread.
Here's an overview of design variations.
Check the fiber+design section of WhatKnotShop on ETSY for this and a variety of similar designs.
design and photographs copyright 2017