In Ireland, mattress sizes typically follow these standard dimensions:

1. Single: 90 cm x 190 cm (3'0" x 6'3")
2. Small Double: 120 cm x 190 cm (4'0" x 6'3")
3. Double: 135 cm x 190 cm (4'6" x 6'3")
4. King: 150 cm x 200 cm (5'0" x 6'6")
5. Super King: 180 cm x 200 cm (6'0" x 6'6")

These sizes are commonly used for mattresses in Ireland and the UK.