As you want one to use after the [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98 ]
Bathmate[/words] or Pumping, I'd advise you go first for one quite elastic/stretchy and not too tight, so you can keep it many hours to keep your temp gains as long as possible (I assume this is your point).
The ones suggested by Crazy Doc look fine, but they look like the tighter one I use for like 30 min to 1h (doing some "soft" clamping/edgeing, or during sex) before using the stretchy elastomer one like
this then.
If this is really the first time you use it, then I'd really advise you start only with the stretchy elastomer/silicon one, just to see how your penis reacts (no signs of coming thrombosed veins, penis not too cold, not too painful, no weird tingling, etc..). If you don't plan on using it for too long (30 min - 1h max), then almost any of them will do the trick
And DLD and Crazy Doc are right, you may want to go for the cheaper ones too, and buy a
package or 2 or 3 since they tend to break easily (depends on your girth too).
I could not find one elastomer/silicon one that lasts for too long yet unfortunately, but I'm also using and manipulating them all day and all night long (with some breaks now and then) so it's quite stressed out :s