Congratulations on the quite-thick penis you've got there. You're more than decently above average girth at 5.75 inches, and you'll find that regular-size condoms really kinda suck for you — they're simply not designed for a dick like yours. Heck, even the so-called "large" condoms will feel pretty tight. But fret not, for there are condoms made specifically to fit your prodigious thickness.
The issue you'll run into is that truly large condoms typically aren't stocked in most stores, so you'll likely have to plan ahead and order your condoms online. Just be sure that you have measured your penis the correct way — at 5.75 inches girth you're looking at around 64-66mm as a good fit for nominal width, and there are some great choices at that size. You can always go for a condom that is snugger or looser if you find you prefer a different fit.
Durex XXL (64mm)64mm nominal width
New to the market in 2020, the redesigned Durex XXL condoms offer a 64mm nominal width in a cylindrical shaft that's roomy from base to tip. At 8 inches they're also among the longest you can buy.
MyOne 2264mm nominal width
MyOne's roomiest offering, the 22 series brings 64mm nominal width for the girthiest of dicks, and a range of lengths from 5.1 inches all the way up to 9.5 inches. No matter your size, there's a fit for you.
My.Size 6464mm nominal width
These German-made natural latex condoms come in a room 64mm size great for larger penises.
Trojan Natural Lamb64mm nominal width
As the name may imply these are made from lamb (specifically, intestines). They offer a realistic feel, but are quite large and and don't stretch much. Also, they'll protect against pregnancy, but not STIs.
Unique Plus XXL66mm nominal width
An exceptionally roomy condom that's also latex-free? That's Unique Plus XXL, with an hypoallergenic polyethylene resin material that while not stretchy like latex, will conform to your shape with ease. It's thin, it's strong, and it'll get the job done.
FC2 Female Condom
Turn the world on end with the FC2 Female Condom, a soft nitrile internal condom that is inserted into the vagina and takes on her shape. It's compatible with penises of all sizes, but is particularly advantageous for very thick men.