Source: Starfinder Core Rulebook p.46
Kasathas are Medium humanoids with the kasatha subtype.
Kasathas can move through nonmagical difficult terrain in deserts, hills, and mountains at their normal speed.
Kasathas have four arms, which allows them to wield and hold up to four hands' worth of weapons and equipment. While their multiple arms increase the number of items they can have at the ready, it doesn't increase the number of attacks they can make during combat.
Due to their in-depth historical training and the wide-ranging academic background knowledge they possess, kasathas receive a +2 racial bonus to Culture checks.
Kasathas receive a +2 racial bonus to Acrobatics and Athletics checks.