Condom Types and Materials Explained | Latex, Non-Latex, and Internal

Condoms come in external and internal styles, made from latex, polyurethane, polyisoprene, natural membrane, or nitrile — and the material decides allergy fit, lubricant compatibility, and STI protection.

A condom that breaks, slips, or gets used with the wrong lubricant fails at the one job it has. The material list looks simple until an oil-based lotion meets a latex condom, or a latex allergy forces a switch.

External condoms sit over the penis; internal condoms are inserted into the vagina and cover part of the vulva. Dental dams are related latex or polyurethane sheets used as barriers during oral sex. Each material carries its own rules, and those rules matter more than brand or price.

What Materials Are Condoms Actually Made From?

External condoms come in four material families — natural-rubber latex, polyurethane, polyisoprene, and natural membrane — while internal condoms use polyurethane or nitrile. Natural-rubber latex is the most common type and offers strong protection against HIV and fluid-transmitted STIs when used correctly. People with a latex allergy or sensitivity need one of the alternatives instead.

They generally work with oil- or water-based lubricants, but may be more prone to breakage or slippage than latex. Polyisoprene condoms are synthetic rubber built for people who cannot use latex, with a latex-like fit and stretch — but oil-based lubricants can damage them. The CDC notes that STI-prevention effectiveness for non-latex synthetics other than polyurethane has not been extensively studied, and FDA labeling restricts their recommended use to people sensitive or allergic to latex.

Natural-membrane condoms, usually made from lamb cecum, prevent pregnancy but have microscopic pores that may let viruses — including HIV, hepatitis B, and herpes simplex — pass through. They are not recommended for STI or HIV prevention.

How Well Do Condoms Prevent Pregnancy and STIs?

Internal condoms report lower typical-use effectiveness, with about 21 of 100 users becoming pregnant in the first year.

Protection varies by infection type. Condoms cut transmission risk most effectively for infections spread through genital fluids — HIV, gonorrhea, and chlamydia. They offer less protection against infections spread by uncovered skin or sores, including HPV, genital herpes, and syphilis, because those can sit on skin the condom never covers.

Fit plays into this more than most people expect. A condom that bunches or slides changes how much skin stays covered, which is why sizing deserves a real look — this roundup of condoms sized for smaller guys covers fit options that hold position better during use.

How Do You Use a Condom Correctly?

Correct use starts before any genital contact and follows the same sequence every time. The CDC’s condom guidance lays out the current steps.

1. Check the package for damage and confirm the expiration date before opening.
2. Put the external condom on before any genital contact — not just before ejaculation.
3. Open carefully, without teeth or sharp objects, and identify which direction it unrolls.
4. Pinch the reservoir tip to remove air, then unroll it fully over the erect penis.
5. Use a new condom for every act of vaginal, anal, or oral sex. Never use an external condom together with an internal condom.
6. After ejaculation, hold the condom at the base while withdrawing, then remove and discard it — do not flush it.

Water- and silicone-based lubricants are compatible with latex condoms. Oil-based products — petroleum jelly, baby oil, and lotions included — can weaken latex and raise the risk of breakage, and the FDA’s labeling guidance for natural rubber latex condoms treats that lubricant limit as a core part of safe use.