good offer set orange foal M Tmavá hříva What does belt size mean

What does belt size mean from the first hole to the last hole:

Sheep's wool

The saddle pad is precisely sewn to maintain its shape even during intense training or demanding competitions

What does length x width mean:

good offer set orange foal M Tmavá hříva What does belt size meanThis good offer set includes an ear net, a blanket, a halter with reins and a leash. Composition of ear net: 100% cotton with certificate Cover composition: Upper material: 100% PES Inner material: 100% PES Cord: 50% cotton, 50% PES Composition of halter with reins: 100% PES, metal components Composition of leash: 100% polyester, metal components