Lightweight Mesh Upper: Lightweight mesh upper with seam-sealed construction for added durability. Easy to wear, easy to clean - the perfect all-year round shoe Environment is our #1 Priority BLOOM Energy Footbed: Rugged Shark cares about our environment: This style is built on a flexible BLOOM footbed. The algae foam midsole creates responsive cushioning while boasting a renewable content of at least 45%. BLOOM harvests algae to clean waterways, and converts that into material we can use. Not only do you get excellent comfort, but peace of mind knowing Rugged Shark is taking steps toward sustainability.