The Westside BT Megasoft Harp is an overstable approach disc. This one is in their mega soft baseline plastic which is very flexible.
*Colors may look different in person due to lighting.
From Westside:
The Harp is our most reliable approach disc. Designed to withstand any type of condition. It will hold in the wind. For professional players, this could be their only approach disc they will need to carry as it can hold anyone's arm speed and still hyzer. For slower arm speeds, it will be your most overstable approach disc.
