Hi all you wise ladies... I bought expensive, good quality sheets because I was so sick of my cheap ones bobbling (or pilling or whatever the hell you call it!). I got two different brands. Anyway, after having them for 4 months both brands have little bobbles on them! (The slighty cheaper one has more). I haven't tumble dried them. Why does this happen? What am I doing wrong? It's driving me crazy and it's such a waste of money.