Bumper

Bumpers are a kind of surface appearing in Splatoon and Splatoon 2.

Function
Bumpers can be found in several different stages, Octo Valley and Octo Canyon. They will be colored in the neutral color corresponding to the ink used by each team; for example, in a pink versus green match, bumpers will be colored cyan.

Bumpers cannot be covered in ink and are generally too tall to be jumped over, allowing them to serve as protective borders for Inklings. However Slosher users can splash ink above the barriers, while still remaining relatively safe.

Splatoon

 * Blackbelly Skatepark
 * Camp Triggerfish
 * Hammerhead Bridge
 * Kelp Dome
 * Moray Towers
 * Piranha Pit
 * Port Mackerel
 * Saltspray Rig
 * Urchin Underpass
 * Walleye Warehouse

Splatoon 2

 * Ancho-V Games
 * Blackbelly Skatepark
 * Camp Triggerfish
 * Goby Arena
 * Humpback Pump Track
 * Kelp Dome
 * MakoMart
 * Moray Towers
 * Musselforge Fitness
 * Piranha Pit
 * Shellendorf Institute
 * Skipper Pavilion
 * Snapper Canal
 * The Reef
 * Wahoo World
 * Walleye Warehouse
 * Shifty Station (Layout 5)
 * Shifty Station (Layout 6)
 * Shifty Station (Layout 7)
 * Shifty Station (Layout 8)
 * Shifty Station (Layout 11)
 * Shifty Station (Layout 12)
 * Shifty Station (Layout 14)

Octo Canyon

 * Return of the Octarians (Mission #1)
 * Enter the Octohurler (Mission #4)
 * The Octopark (Mission #5)
 * Octozeppelin Invasion (Mission #6)
 * Octoling Strike (Mission #9)
 * The Floating Garden (Mission #11)
 * Octo-Resort Spring (Mission #12)
 * Dancing Floors (Mission #13)
 * Parking Garage (Mission #14)
 * Towering Heights (Mission #18)
 * The Experimentorium (Mission #19)
 * Octolings Ahoy! (Mission #21)
 * Underground Expressway (Mission #22)
 * The Octogalaxy (Mission #23)
 * Platform Madhouse (Mission #25)
 * Octoling Workout (Mission #27)

Trivia

 * The official name of Bumpers was unknown until the release of the Octo Expansion and its Mem cake.