The extension is 8a.

ClimberDateStyle
Tophe 28/Jun Lead O/S
with Nina
RD 21/Aug/15 Lead
Hidden 27/Aug/14 Lead
Rachel Slater 21/Sep/13 Lead RP
Voting
High 7a+
Mid 7a+
Low 7a+
High 7a
Mid 7a
Low 7a
High 6c+
Mid 6c+
Low 6c+