Radii Thriller The Radii (ray-dee-eye) footwear collection contains uniquely designed lifestyle sneakers that enhance your personal style. The Radii Thriller is an ultra high cut model with distinct styling. Available in multiple colorways and materials, they feature a high lace up style, leather upper, and a comfortable fabric lining. Some models even include an all over perforated design. Lace them up and make a stylish statement.