Swim Speed Up

 is an ability in and. Krak-On gear has a 5× chance of rolling this ability.

increases movement speed while swimming in squid form. Like Run Speed Up, this ability comes in handy during the opening moments in a match when players are heading toward a stage's center. It is especially useful in Ranked Battles as players need to get to a certain place quickly.

Splatoon
increases movement speed while swimming in squid form and Kraken form by up to 25%.

Use
This ability makes it easier to chase enemies with the Kraken.

Gear
is the main ability of:

Splatoon 2
Swim Speed Up increases swim speed by up to 20% for players with light weapons, up to 25% for those with medium-weight weapons, and up to 38% for those with heavy weapons.

These weapons (and variants) are light: Aerospray,  Bamboozler,, , , , , ,.

These weapons (and variants) are heavy:, ,.

All other weapons have a medium weight.

The ability can be used to nullify speed penalties from weapon weight and by using the amounts shown in the following table.

Gear
is the main ability of:

Stacking
The table below shows how much Swim Speed Up increases swim speed with the different weight classes.