In Ireland, mattress sizes typically follow European standards, which are similar to those in the UK. Here are the common mattress sizes:

1. Single: 90 cm x 190 cm (35" x 75")
2. Small Double: 120 cm x 190 cm (47" x 75")
3. Double: 135 cm x 190 cm (53" x 75")
4. King Size: 150 cm x 200 cm (59" x 79")
5. Super King Size: 180 cm x 200 cm (71" x 79")

These measurements are typically for standard mattresses, and variations may exist based on manufacturers. Some stores may offer custom or non-standard sizes as well.