Howdy friends, this is a bit delayed but I hope still appreciated and useful.
We have six sleeves. Fer' reference I'm 6" long, 5" girth. When purchasing a sleeve look at the *internal* usable length and girth to see if it will fit him. There are "extenders" that can help that are sold by OxBalls if you find a sleeve is too long for him. We generally try and go for a medium firmness, if offered. Bad Dragon has firmness samples you can buy. All of our closed tip sleeves hold better if you can squeeze the air out, which provides a bit of suction. The following is what we own and my general thoughts on fit. I'll try to update later with more recent reviews of each.
1.
Chance Equine Sleeve. $70. One size. Bad dragon is an amazing vendor with fantastic quality and variety. You can look at the dimensions on the page. This fits just about perfectly, if a tad too snug. Rolling it on can help but be careful not to tear the silicone. There is no open head but I prefer that as it helps me last longer and I can still get off based on how much she's getting into it.
2.
Magnus Canine Sleeve (open head). $70 for medium sized. She likes this one, but I'm not a fan of the open head. The ridge of the open end is uncomfortably tight and just under the mushroom of my lil guy. Not super comfortable. Longer guys may have better luck.
3.
Flint's Dragon Sheathe (open head). $70. I only got to use this once as she hated this sleeve. I learned that day that she does not enjoy fancy textures, and the ribbed exterior was not comfortable for her. I don't recall my own opinion of the sleeve, but judging by the dimensions on the website it's tighter than Magnus so I likely would have had issues getting it on.
4.
The Mailman by Blissful Creations. $117. I'll try to find the specific size we bought. This is tied with the Chance equine sleeve for her favorite. Great size and great quality. I might recommend getting a size that is a wee bit snug as this thing is *heavy*. You'll need to roll it on and use a tiny bit of lubricant to help get it secured just right, but too much and the weight will cause it to slide off.
5.
Fat Boy Penis Sheath. $50ish. We got this for the light girth it added (her inclinations tend towards a fuller sensation rather than length). It has a wonderful velvety/soft texture, but it is *so* stretchy that we ended up putting this *over* the mailman sleeve too! We did not care for it by itself, but found it best to combo with other sleeves. Note: We bought ours from a local shop
6.
OxBalls Cock Sheath. $45. Another good one, but I don't think this is the right model for what we have. This is also a candidate for combining with the Fat Boy Penis Sheath. Note: We bought ours from a local shop.
I hope that helps you folks have some more fun! Feel free to ask any follow up questions.