All our sheets are Oeko-tex® certified, the label that protects you from being exposed to substances that are harmful to health. The canvas weaving of fine yarns makes the sheet nice to lie on. Juna box sheets can be used on both spring mattresses and box spring mattresses up to a height of approx. 26 cm. The sheet itself has a height of 30 cm and since there is elastic all the way around the edge, the edge fits perfectly under the mattress