If you're over, say, 25, you'll probably remember when mattresses only came in standard sizes. You probably had a twin, full, queen or king size mattress, which may have been no more than 8" thick. But with today's mattress improvements and trends, you could have a king sized bed, but the standard king sized sheets may not necessarily fit. Why? Because mattress manufacturers have made significant changes to mattresses, including things like pillow tops and general extra thickness.

Knowing this, you will have to take care when buying sheets for your mattress, otherwise you might have sheets that won't quite wrap around the edges, or do, but continually slip off. Each package of sheets typically provide the exact measurements of the sheets, so it's important for you to pay attention to them. Measure your mattress before you go shopping so that you will be prepared to make a decision. If you have a mattress over 10 inches thick, you may require what's called deep pocket cut or deep profile bed sheets (as pictured above). Pay extra attention to the depth reach of the fitted sheet measurements on the packaging for best results.