These sleeves have been torture tested by some big names in the PE world and are the favorite of "BD" and "PervMcSwerve, from reddits r/gettingbigger.
If you're looking for a sleeve that has the right combo of flexibility and durability for repeated folding rolling and hours of strain, these are the ones.
• Highly durable to resist tearing yet stretchy enough for easy folding/rolling.
• Reinforced thicker upper portion to ensure your seal never breaks no matter what cup you use.
• Measure the width of your FLACCID STRETCHED shaft below the glans.
• ALWAYS make sure the sleeve is smaller than your current measurement as you will thin out once stretched.
• When in doubt size down for maximum seal.