I need to get a mattress for a cot. Mattresses seem to come in two sizes: 60 x 120cm and 70 x 140cm. According to various advice, the 70cm is for a cot bed and 60 for a cot. I've measured the inside of the base (I.e. the distance between the "walls" of the base that hold it in plane and its 64cm. Also the base is 140cm long.
So what size do I need? 60 seems too narrow (and short) but 70 too wide and it's not a cot bed, just a cot. Does the 70 squeeze in or the 60 flatten out?