【Heat-Generating Material】This material absorbs the water vapor emitted from the body with highly absorbent rayon. The energy released by this moisture is converted into heat, causing the fabric itself to generate warmth, making even thin pajamas warm. The image shows how the slight water vapor from the body turns into heat with Heattech. 【Easy-to-Wear Loungewear】Features a simple open-collar design, with nothing to hinder turning over in bed. The waist has an elastic belt design for easy on and off. Easy turning over can improve blood circulation and reduce stress from stimuli during sleep. 【Relaxed Fit】Compared to regular pajamas, these pajamas provide a fluffy feel. They are made of lightweight and warm fabric. Also, they are designed to be more relaxed than the usual type, so your back and stomach won't be exposed when you bend over or stretch. 【Heat Retention & Breathability】Combines high heat retention and breathability, and is made of a material that feels soft, keeping you feeling dry and comfortable even when you sweat. A staple item for autumn and winter loungewear! Static electricity is unlikely to occur, so those with sensitive skin can rest assured. A comfortable loungewear set for autumn to early spring, available for immediate delivery after purchase on Amazon. 【SIZE: M】Recommended weight: 45-55kg, Height目安: 160-168cm ※ Hand wash or, if using a washing machine, we recommend using a net and the delicate cycle. Dark colors may fade or transfer color, so avoid washing them with light-colored items. 〈Note〉 This is for men, but because there is no pajama category for men, it is listed in this category.