I was very hesitant to order these sheets, period.  Unfortunately I read the lowest ratings as well.  Now, I offer my 5 star rating.  These are quality sheets, soft and sturdy.  I have Tempurpedic twin adjustable beds for king size measurements.  These sheets hold them together perfectly.  The sheets are a Perfect Fit for this.  Nice, deep corners and large enough to tuck under both mattresses on the sides.  Top sheet fits perfectly as well, not too big, not too little. If you have this arrangement, order!  You will be happy.  I only suggest you have at least a 15+ inch mattress or then they may be too big.  One last thing.  Don't expect these sheets to be wrinkle-free.  They are 100 percent cotton.  Have washed them in HE washer and dried them on high heat.  Took them out when dried and folded.  Softer and mildly wrinkled, just as cotton does.