Hello is this made of cotton? Also, will this fit a mattress of size size: 74 x 38 x 10 cm?

HI Nimish, thank you for your inquiry, the Living Textile 2pk sheets are made from 100% cotton and will fit mattresses 35 x 72 x 10cm each. We hope this helps. If you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have.