Used once - as-new condition. Worked really well so I bought a more expensive system (8sleep).
Excellent for heatwave - cools the bed. It is a therapeutic mattress topper that uses water circulation to actively cool or warm your bed between 18°C and 48°C. It is designed to relieve night sweats, hot flashes, restless legs, and back pain.
https://www.climsom.com/eur/Climsom-alternative-to-air-conditioning.php
https://www.amazon.de/Climsom-Matratzenauflage-Klimatisierte-einschlie%C3%9Flich-Baumwolle/dp/B00CTSUUHE