Features: 100% brand new high quality Lightweight men's thermal underwear,suit ultra-thin constant temperature. 9 degrees Celsius heating, thermal storage and warmth preservation. Seamless : It perfectly fits the body, not bumpy; keep you looking good and feeling good. Elasticized Waistband : Wide waistband design sits just suit for your hips and shaping your tummy and buttock without squeezing or rolling down Easily Ultra Elastic : Made from soft elastic materials keeping you comfortable for pressure free movements Perfect for Traveling : Perfect for matching tiny tank and ganna jacket, even for sporty T-shirts Machine-washable & quick drying Specifications: Name: Silk and cashmere seamless warm underwear set Size: L/XL/2XL/3XL Ingredients: Surface layer : 47.9% recycled cellulose fiber, 45.8% acrylic fiber, 6.3% spandex fiber Inner layer : 48.1% recycled cellulose fiber, 34.4% acrylic, 8.8% spandex, 3.7% cashmere, 5% mulberry silk Fabric name: De rong Number of layers: Single layer Main fabric composition: acrylic fiber Top style: can be worn externally/bottomed shirt Neck shape: round neck Applicable gender: Female Whether to add velvet: Yes Applicable age group: Youth (18-60 years old) Function: waist protection, anti-static, body shaping, lifespan, heat generation, antibacterial, warmth preservation, belly protection, anti pilling Package included: 1 set underwear