Ergonomic back protector with composite structure, provided with a series of polypropylene articulated outer plates, designed with corrugated reinforcing structure to distribute concentrated impact forces over a wider surface area. Inner core in high quality aluminium honeycomb, an ultra-light material capable of ensuring maximum energy absorption and optimum elimination of heat and humidity. Innovative double density thermoformed perimeter structure to support the plates, for maximum comfort in contact with the body and thermal comfort. Provided with adjustable removable braces and lumbar band with double adjustment strap to ensure perfect fit. The articulated plates and patented lumbar joint allow this protector to follow the body's movements, maximizing ergonomics.