The use of purified marine sands make it possible to naturally transmit their beneficial warmth. Heating: 48-52°C (initial 30 minutes) 52-56°C first hour, up to 65°C following hours. External cover in cotton (94%) and nylon, internal bag in PVC. Operating power: 230 V - 50/60 Hz - 75 W. Sold in 6 languages box (GB, FR, IT, ES, PT, DE). Dimensions: 39 x 30 cm