Sexy Black Strappy Heels These Vivianly Square Toe Mules Sandals ($40) were the first pair of heels I purchased from Amazon, and I immediately fell in love. The two top straps on the shoe are actually stretchy, which makes these shoes extremely comfortable to wear for long periods of time. I brought these along on my recent trip to Mexico, and I was able to dance the night away without a single blister or sore toe. Image Source: amazon.com Square Toe Mules Sandals $40 from amazon.com Buy Now