- Genuine light blue striped sleeveless t-shirt. 100% 240g/cm Cotton. These are of a very high quality, not the usual lesser quality offered by others. - Fabric: Interlock is a knitted fabric made of cotton, which has several amazing properties. It is smooth on both sides, breathable, wear-resistant (little creases and quickly restores its shape after deformation), soft, durable, attractive. This fabric is absolutely natural, so it never causes allergies and even skin irritation. Made in Ukraine.