Originally I was slightly confused by the measurements - I measured our 2 windows and kept getting 31". I decided to try it and ordered two of the 30" Cordless Blackout Thermal Insulated Roman Shade in White. The size ended up working out. Slight slivers of side light, but I have curtains on the windows as well, so it works for me. The quality is good, they really do block the light. 

These shades have handles that are sewn underneath to control the up/down movement without damaging the shades. On one of them, it was sewn in too long. You could see the handle hanging down. I fixed it by using 3 safety pins and pinning it shorter to match the other shade, instead of returning or trying to alter them in any other way. I am still really happy with the purchase (so far)!