A:
I dig that name, mine should be monkeybrain: ) Here's a run down on the sizing, remember they stretch:
Medium: 10.5" x 30mm obj.
Large: 12.5" x 42mm obj.
X-Large: 12.5" x 50mm obj.
XXL: 15.5" x 50mm obj.
The first number is the maximum length of scope it will fit comfortably, the second is the objective diameter (the big side). Hope this helps.