Waterproof or breathable — can I get both?

Sort of. The trade-off shows up repeatedly in community threads: 100% waterproof protectors use a TPU or polyurethane membrane that some sleepers find hot or crinkly, while breathable cotton or polyester-only protectors stop dust and allergens but won't fully block liquids. Cotton-terry-faced waterproof designs (like SureGuard's) are the most common compromise reviewers point to.