Boning is a type of material that is used mainly to reinforce seams in clothing, especially underwear and corsets. It is a narrow, flat strip made of plastic, metal, or an elastic material. Boning is sewn along the seams in order to maintain the shape above them and ensure the durability of the construction.

Types of boning:
1. Metal boning: made from a thin steel strip coated with a special anti-corrosion layer. It is resistant to deformation and provides strong support.

2. Plastic boning: made from durable, flexible plastic. It is lightweight, resistant to corrosion and can easily withstand washing.

3. Woven boning: a special type of boning that is used in underwear and other garments to maintain a given shape and provide a comfortable fit.

4. Spiral boning: made from bent wire in a spiral form. It is flexible, corrugated, and can be sewn into more rounded seams.

5. Adhesive boning: a type of boning that can be stuck onto the fabric instead of being sewn in. It is convenient to use, but it may come unstuck over time.