Nike Vapor Ultrafly Keystone Baseball & Softball Cleats with Fastflex Neon Yellow & BlackSize 4.5 Youth. A little discoloration from the sand, but that won't be noticeable after a day on the baseball field. These cleats are in great condition. Smoke Free Home. Neon yellow with back and white. Keywords: Nike Vapor Ultrafly Keystone Baseball & Softball Cleats with Fastflex Neon Yellow & Black