Kingsize Flat Sheets The Helena Springfield plain dye collection is available in a palette of 10 colours. Four classic neutrals; white, ivory, cream and linen are complemented by a soft gold, aqua, pink, blue, navy and red. Available in four sizes of fitted sheets, flat sheets, base valances, standard and oxford pillowcases and made from soft smooth 180 thread count poly cotton percale, which is durable and easy to care for.