Advanced piriformis stretch E1 in master the pike - bolster size?

[Eels]

What bolster size is used in the advanced piriformis E1 stretch in master the pike. For other earlier stretches I used cushions rather than a bolster. For this stretch I’ve used two yoga blocks end to end with a rolled yoga mat on top.
 

I’m thinking a bolster would be more comfortable, but they come in different sizes.

What size does Kit use in the video (diameter and length) ? 

[Kit_L]

Hello there,

The thickness is simply whatever you need to tip you sufficiently in the direction you need to go in to help the stretch. The tighter you are, the thicker the support you need. I've seen some guys use two bolsters to get enough height!

The bolster I'm using is a standard one in the yoga world, and it's about 200mm in thickness and about 600mm in length (8" x 24"), but these are approximate. The really important thing is that it must not deform much under your weight (and that's why cushions are not very good—not firm enough).

[Eels]

Thanks so much. I’ll get some help to measure up what I need.