Materal:100% Silk Size Chart Our size is chinese size small than  US size , Eur size. Please order the size Strictly according to weight range M Below 50kg L Below 54kg xl below 64kg 2xl below 70 kg Also consider bust and height,   if height above 173cm ,please consider order 2xl , Make sure the pants length is good. Thank you for your attention. About Silk Material Pajamas Made of 100% Natural Silk soothe the nerves and promote sleep The chemical structure of silk protein in silk pajamas is 18 kinds of natural amino acids. These amino acids contain a tiny molecule called "sleep factor" which has the effect of stabilizing nerves and eliminating fatigue. It can effectively improve sleep, increase sleep depth, and eliminate Fatigue during the day. Silk Pajamas Advantage First. Environmental protection Silk pajamas are made of natural mulberry silk, which is pollution-free and truly green. Second, beauty skin Mulberry silk in silk pajamas is composed of natural protein fibers containing eighteen amino acids required by the human body. Its chemical structure is similar to human skin and has good compatibility. It can help the skin maintain the metabolism of the lipid film on the surface, prevent skin aging, promote blood circulation, delay aging, and keep the skin moist and smooth. It has obvious effects on allergic skin and pruritus. Third, gentle and smooth Silk feels natural and smooth and smooth, close-to-skin is the second skin of the human body known as "fiber queen", which is close to any fiber. Fourth, close and comfortable The surface of silk pajamas is smooth and supple, and its friction stimulation coefficient to the human body is the lowest among all kinds of fibers. When our delicate skin and smooth and delicate products meet, its unique soft texture, according to the curve of the human body, considerately and safely cares for every inch of our skin. Five, warm in winter and cool in summer The silk in the silk pajamas contains the highest silk volume voids in the fiber, which can play a two-way adjustment function. When it is cold, it reduces heat transfer and keeps warmth better than cotton and wool. When it is hot, it can discharge a lot of heat, keep the body temperature constant, and play the role of warm in winter and cool in summer. Six, moisture absorption The silk protein fiber in silk pajamas contains a kind of hydrophilic side chain amino acid substance, which can absorb moisture and emit moisture in the air, and maintain a certain amount of moisture. It can help the skin retain a certain amount of moisture under normal temperature and not make the skin too dry. When it is hot, it can quickly dissipate the sweat and heat emitted by the human body, which makes people feel extremely cool.