A seal (300) for use in a cable gland (301) is disclosed. The seal (300) has a body portion (308) formed from a first rubber material having a first hardness and seals against a cable (320). The seal (300) also has one or more support portions (302,304) formed from a second material that is harder than the first material and supports the structure of the body (308) against excessive deformation as well as forming a mechanical grip with the cable (320).