Brand: GOKUMIN Kyoku-Dan Thermo Box Sheet Winter Bed Sheet 【Ultimate Warmth, Lay-on Blanket】 Microfiber Attached to the Mattress Pad Anti-Static, Washable Bed Pad T-GDB (Single) Color: Black Suggested Retail Price: 7,980 yen New, Unopened 【Revolutionize Warmth in Winter, Just by Laying It Down】 "It's cold for a while even after getting into bed on winter nights," "My throat hurts from dryness when I turn on the air conditioner"... This "Kyoku-Dan Thermo Box Sheet" solves these problems by simply laying it under your bedding to warm you gently from your back. It creates a comfortable sleeping environment that retains body heat without the need for heavy blankets. 【Moisture-Absorbing Heat Generation x Insulation Structure for +5℃ Warmth】 Adopts a unique multi-layer insulation structure and moisture-absorbing, heat-generating fibers. It absorbs sweat and moisture during sleep and generates heat, warming your entire body from your back, providing lasting, natural warmth. Furthermore, the high-density fiber's heat retention effect has been proven to increase the perceived temperature by +5℃ compared to conventional products. 【Sleep Changes Because Warmth Lasts】 "The nights you used to worry about being cold are now something to look forward to" – It's not just warm; it allows you to relax and sleep deeply, so you wake up feeling refreshed. You can sleep comfortably without relying on the air conditioner, freeing you from the stress of dryness and electricity bills. It's a new standard winter bedding that the whole family can use with peace of mind. 【Trusted and Proven with Over 2 Million Sold】 Over 2 million units sold in the series, with an average review score of 4.4 or higher. Furthermore, it has been confirmed by a Japanese inspection organization that the antibacterial and deodorizing effects last even after 100 washes. It's safe with quality that combines cleanliness and durability. 【Ultimate Warmth That Accompanies Sleep】 "We want to deliver bedding that allows you to sleep with peace of mind from the moment you get into bed, even on cold nights" – The Kyoku-Dan Thermo Box Sheet was born from this desire. We deliver health and vitality through comfortable sleep to you who work hard every day. Product Name: Kyoku-Dan Thermo Box Sheet Accessories: Japanese Instruction Manual, FAQ Size: 100 x 200 x 38cm Product Weight: Approximately 1.6kg When shipping, the shipping label may be affixed directly to the box. Therefore, there is a possibility that the box may become dirty or torn during shipping. Please check my profile and proceed with the purchase only if you agree. Please feel free to ask any questions in the comments.