Sneakers are all about the sole for next spring. Whether the style is classic, throwback, tech-y or crafty, the soles are chunky, dimensional and contoured. Bright white is key, either matching or contrasting with neutrals or color-blocks. Upper materials range from simple canvas to neutral suedes to leathers that are finished with metallic sheen. Some of the most forward looks integrate the soles with the upper, for a streamlined new take on the molded shoe.