These cute panties are from Liz Claiborne. They are a size Large.
The material is 91.5% Polyester / 8.5% Spandex.
There are pink trimmed 2 inch slits on either side.

Laying flat, the panties measure about 14.5 inches wide relaxed, comfortably stretching to about 19 inches.
The rise is about 9.5 inches.