A genuine category rather than a novelty, but the dress code question decides whether they are worth owning.
A golf sandal is a spiked or lugged outsole under an open upper. The sole is doing the same job as a normal golf shoe; the upper simply lets air in.
This is the whole decision. Plenty of public and resort courses permit them; a meaningful number of private clubs still require a closed shoe. If you own one pair of golf shoes, do not make it sandals.
A phone call to the pro shop settles it faster than any policy page.
| Sandal | Closed shoe | |
|---|---|---|
| Heat | Much cooler | Warmer, even in mesh |
| Lateral hold | Less — the upper cannot brace the foot as well | Better |
| Wet grass | Feet get wet immediately | Stays dry until it does not |
| Debris | Sand and grit get in | Stays out |
| Where allowed | Variable | Everywhere |
Sandals are a second pair, for hot weather on courses you know accept them. As a primary shoe they cost you grip in exactly the conditions — morning dew, slopes — where grip matters most.