When selecting a water-resistant sunscreen, look for products labeled as 'broad-spectrum' with an SPF of 30 or higher. Broad-spectrum sunscreens protect against both UVA and UVB rays, reducing the risk of skin damage and sunburn. Always check the label for the water-resistance duration, which is typically 40 or 80 minutes. This indicates how long the sunscreen will remain effective while you're in water or sweating.