The Stan Smith was one of the most popular sneakers of 2014. After releasing a number of high-end versions last year, adidas Originals collaborates once again with Belgian fashion designer Raf Simons for a Spring 2015 collection of the iconic sneaker. Much like the the all-around orange pair we saw from his Fall/Winter 2014 collection, this current range features four new monotone iterations of the premium shoe. Included in the pack will be tonal shades of grey, pink, red and sky blue. Each one will have a perforated letter 'R' instead of the usual three stripes and have Simons' name stamped on the heel. The Raf Simons x adidas Originals Stan Smith Spring 2015 Collection will be available on March 31.