RFSU condoms have a backrest behind them that makes them totally reliable in both strength and design. Tigh condoms are somewhat less thick than standard sizes, 49mm vs. 54mm, making them better suited for smaller sizes. They are lubricated, have a tank and made of natural rubber latex.
RFSU is the organization who manufacture these condoms. It is the Swedish Association for Sex Education, founded in 1933 and the leading Swedish organization for sexual and reproductive health and rights.