Today is the first day I'm wearing these sandals and no break in time needed. They're super comfortable,lightweight, and cute. I wear a size 9 in tennis shoes and sandals, and I bought these in a size 9 as well. They fit perfectly lengthwise. The straps aren't tight or too loose. The sandals fit me to perfection. No heel pain, they have plenty of cushion in the heel with just enough heighth to wear slacks with them. I love 'em!! Will definitely be buying more.