King size bedsheets are where the dimension problem shows up most clearly. One brand's king size is 90 x 100 inches. Another's is 90 x 108. The difference is eight inches of tuck — the difference between a sheet that stays on the mattress properly through the night and one that pulls off corners by 3am. Our king size cotton bedsheet is 90 x 108 inches — the right dimension for standard Indian king mattresses with enough tuck on all sides to stay put.king size bedsheets