The WOOD of 55 WOOD is wool

45 POLYESTER means 45 polyester fiber.

Polyester fiber is a kind of polyester, which is a cheap fiber material. The advantages are that it is strong and wear-resistant, has a certain stiffness, is easy to wash and dry, has good color fastness, does not fade or shrink. Disadvantages: fear of Mars, non-breathable, will become translucent when exposed to water, the friction parts of the fabric will shine, poor thermal insulation performance, etc.