Pool goggles vs. open-water goggles — what's the difference?

Open-water and triathlon goggles typically have a larger lens for wider peripheral vision (helpful for sighting buoys), tinted or mirrored lenses for outdoor glare, and a slightly bulkier, more comfortable seal for longer swims. Pool racing goggles like the Speedo Vanquisher line are smaller and more hydrodynamic but trade off field of view. Several triathlon-forum reviewers prefer the Arena Cobra Tri specifically for that larger field of view.