A little extra push. The juniors' Ultraboost running shoes serve up comfort and responsiveness at every pace and distance. The adidas PRIMEKNIT upper includes foam around the heel to prevent blisters. You'll be riding on a BOOST midsole for endless energy, with a Linear Energy Push system for more responsiveness than ever before. A Continental Rubber outsole grips in wet and dry conditions so you can stride confidently. Ultraboost 22 Running Shoes (Big Kid)