Please read before purchasing. *Due to the nature of polyurethane, the urethane itself may temporarily harden when the temperature drops. It usually returns to normal after being left at room temperature for 1-2 days. If it doesn't inflate, try tapping or kneading the neck pillow to introduce air and help it recover.* 【Ultimate Fit】 Made with low-rebound, high-density polyurethane material that promotes comfortable sleep, providing excellent cushioning and delivering blissful relaxation. This neck pillow (travel pillow) can be used while sitting in a chair. It's made of low-rebound urethane material, so there's no need to inflate it with air; you can use it immediately after taking it out of the storage bag. 【Ergonomic 3D Design】 Ergonomic 3D curved design. It gently supports the head, neck, and shoulders, conforming to the curves of the cervical spine. With good cushioning, it supports the neck and back of the head, effectively reducing the burden on the shoulders, spine, and neck. 【Compact Storage】 Ultra-lightweight at approximately 330g and comes with a storage bag for compact storage. Not only does it have a dedicated storage bag, but the included eye mask and earplugs further enhance comfort during travel. 【Supervised by a Judo Therapist and Sleep Improvement Instructor】 Supervised and recommended by Mr. Daisuke Higashi, a Judo therapist from Higashi Acupuncture and Osteopathic Clinic, which has been in practice for 12 years, and Ms. Yuka Kawamura, a sleep improvement instructor. 【Material Safety】 Passes strict inspections by public institutions. Committed to quality and safety, we use fabrics that have passed formaldehyde testing by a third-party organization, which is a substance that is highly likely to cause cancer and can irritate the eyes, throat, and nose, and is also a cause of atopic dermatitis. 【Versatile Use】 Can be used in various situations such as on the Shinkansen, trains, airplanes, night buses, long-distance buses, and in the passenger seat of a car during travel and business trips; during overseas and domestic travel; in movie theaters and for watching movies; for watching plays; and for relaxation on chairs and sofas at home or in the office; for remote work and breaks during work, and for naps.