Insert Size Guide
Our general recommendations for what size insert to use for each size pillow cover:
SQUARE
16x16 cover - 16x16 insert
17x17 cover - 18x18 insert
18x18 cover - 20x20 insert
19x19 cover - 21x21 insert
20x20 cover - 22x22 insert
21x21 cover - 23x23 insert
22x22 cover - 24x24 or 25x25 insert (the larger size will give you a fuller look and firmer feel)
23x23 cover - 26x26 insert
24x24 cover - 27x27 insert
25x25 cover - 28x28 insert (you can also use a 29x29 insert if you want it to look really full)
26x26 cover - 29x29 insert (you can also use a 30x30 insert if you want it to look really full)
LUMBAR
10x18 cover - 10x18 insert
11x17 cover - 12x18 insert
11x19 cover - 12x20 insert
12x20 cover - 13x21 insert
12x22 cover - 13x23 insert
13x19 cover - 14x20 insert
13x21 cover - 14x22 insert
14x20 cover - 15x21 insert
14x26 cover - 15x27 insert
14x30 cover - 14x30 or 15x31 insert
14x38 cover - 14x38 or 15x39 insert
14x48 cover - 14x48 or 15x49 insert