Strength Shop 'Hercules' single ply elbow sleeves (price per pair).
As used by U105 Log Press Record Holder (170kg) and BSM 2011 Graham Hicks.
Photo shows Graham doing an easy 110kg log as part of an overhead medley.
To measure, check the circumference of your elbow with your arm straight. If you're on the cusp of two sizes and prefer them tight go for the smaller of the two sizes, and if you prefer them not so tight go for the larger of the two.