Released in 2013, Boost technology made adidas sneakers more responsive than the standard EVA rubber. This resulted in increased energy-return that provided ideal cushioning for a natural stride. The adidas UltraBoost Uncaged sneaker keeps some elements of the UltraBoost like the Primeknit upper and Stretchweb outsole, while also dropping its typical Three-Stripes caged branding for a simple, yet effortless design.