While hockey and lacrosse arm pads both serve a protective function, they differ in design and emphasis. Hockey arm pads are typically bulkier and offer more comprehensive protection, particularly around the elbows, due to the higher impact nature of the sport. Lacrosse arm pads, on the other hand, are often more streamlined and prioritize flexibility, allowing for a wider range of motion. They focus on protecting key areas like the elbows and forearms from impact and abrasions.