Open-heel fins leave the heel open and use a strap; full-foot fins enclose the heel in a foot pocket. Cressi lists Palau open-heel sizes from EU 32 to 47 and Agua full-foot sizes from EU 35/36 to 45/46; those ranges apply to those models only. Choose by the exact size chart, heel retention and the socks or booties the model permits.
Open-heel and full-foot describe how a snorkeling fin holds the foot. The useful comparison is the exact foot pocket, strap and size chart, because the same label does not guarantee the same fit across brands.
Compare the foot-pocket styles
| Style | What to compare |
|---|---|
| Open heel | A rear strap holds the foot in an open-backed pocket. Check the adjustment range, heel contact and the footwear allowed by that model. |
| Full foot | A closed pocket surrounds the heel. Match the foot to the model’s chart and check that the pocket feels secure without pinching. |
The terms describe construction, not a universal use rule. Cressi says its Palau open-heel pocket is designed for bare feet, while its Maui can be worn barefoot or with light socks and has a strap cleat for fine adjustment. If you plan to wear booties, check the maker’s instructions rather than assuming every open-heel fin is built for them.
Use model-specific charts
Cressi lists the Palau across EU sizes 32 to 47 and its Agua full-foot fin across EU sizes 35/36 to 45/46. Those are separate product ranges, not a conversion between the two designs. Mares describes the Manta as a full-foot snorkeling fin; its chart maps EU 36/37 to 46/47 to US size groups from 4/5 to 12/13. Use each chart only for its named model.
When trying a pair, use the footwear you expect to wear, follow the maker’s fitting steps and check for a stable heel and comfortable toe space. Do not size from a casual shoe alone when the manufacturer provides a fin-specific chart.
Choose by your session
- If you prefer a heel strap, compare the open-heel model’s adjustment method and the foot sizes its chart covers.
- If you prefer a pocket that covers the heel, compare full-foot sizes against your foot and any footwear the maker allows.
- For travel or sharing, check the named model’s dimensions and size range. Cressi describes its Palau as adaptable across adjacent sizes, while another model may use a narrower size grouping.
For mask styles, see full-face versus traditional snorkel masks. If you are choosing fins for lap-swim training, compare short and long blade swim fins, a different decision from heel construction. Browse snorkel and dive gear.
Sources
Common questions
What is the difference between open-heel and full-foot fins?
Open-heel fins have a heel opening and strap; full-foot fins have a pocket that covers the heel. Strap design, fit and size ranges vary by model.
Can I wear open-heel snorkeling fins barefoot?
Some models are designed for bare feet. Cressi describes its Palau as made for bare feet and says Maui can be used barefoot or with light socks; check the exact model instructions.
How do I choose a snorkeling-fin size?
Use the chart for the exact fin and account for any socks or booties the model permits. Do not transfer a size from another brand or model.
Are all open-heel fin straps adjustable?
No. Strap construction and adjustment vary. Check the maker's fitting instructions and make sure the selected size stays on without shifting or uncomfortable pressure.