95% Modal Cotton / 5% SpandexKEEP YOUR CHILD WARM: This Thermal Underwear set is made of 95% Modal-Cotton and 5% Spandex that feels so silky soft on the skin while keeping children warm in the chilly weather. Also great as pajamasMADE TO LAYER: This thermal underwear is designed to make layering easy and comfortable. Modal with Spandex gives this two piece long johns just enough stretch to cover the body comfortably yet not loosely. Makes you warmer without being too bulky. This clothes stretch comfortably so it is great for those active little ones.9/10 SLEEVES: This base layer has sleeves which are slightly SHORTER compared to normal shirts so that they hide under other layer.DOESN'T RIDE UP: The set fits very comfortably, neither too tight nor too loose, with just the right amount of stretch. The shirt sleeves and pant legs don't ride up.DRY & FRESH: Modal doesn't trap perspiration and odors and is up to 50 % more absorbent than cotton, so clothes never feel sweaty and sticky. And also extremely hard-wearing and keeps its shape and finish, even after frequent washing. *PLEASE note that this item does NOT ship from China. Unfortunately, sometimes other sellers try to sell THEIR items under this listing, but those are not the same products as shown in the listing. Please check the label "LA LA ETOILE" to see if yours is genuine.