I'm embarrassed to say I accidentally bought this thinking it was a cool ring. ・Opened once, but unused ・Size M ※I will put it in a bag and package it, and ship it via post-in. No pets, no smokers. Here are the specifications: - Product Name: Warm Ring PCM Neck Warmer - Size: M - Temperature: Warms up to 48℃ - Features: Comes with a fur cover for a comfortable feel - How to use: Can be used repeatedly Warm Ring Warm Ring Gray L size Material (Body) External TPU, Internal PCM (Cover) Polyester Melting Point: Approximately 48℃ Body Dimensions: L Inner diameter approx. 11cm Thickness approx. 2.2cm Inner circumference approx. 34cm Neck size guide 32-36cm Weight (with cover) approx. 150g Heating product using the latest material [PCM material] PCM thermal neck ring with fur cover