it is bi-elastic (meaning

as well as a 4cm  elastic band on the back for an optimal fit

as it is highly breathable and warm enough to be worn from autumn to spring

made with a very elastic and slightly compressive fabric to provide an even distribution of elasticity and adapt to all types of backs

El tejido principal es ligero

Interior Primaloft Meteorite Hombre Size:M it is bi-elastic (meaningThermal base layer made with PrimaLoft, allowing the skin to breathe, keeping the body dry, and protecting from the cold. Ultrafine thermoregulating fiber providing softness and comfort, thermal insulation, and additional warmth, it is antibacterial and odor resistant. Versatile garment suitable for both winter and spring.