Choosing the right size before you order saves you the hassle of a return. This guide covers every standard US mattress size, pillow size, and duvet insert size that Mellanni products are designed to fit. If you ever land between two sizes, the general rule is to go one size up — a slightly larger sheet always tucks in more comfortably than one that’s too snug.Documentation Index
Fetch the complete documentation index at: https://docs.mellanni.com/llms.txt
Use this file to discover all available pages before exploring further.
Mattress sizes and sheet sets
The table below lists every sheet set size Mellanni offers alongside the standard mattress dimensions each one is designed to fit.| Size | Mattress dimensions | Notes |
|---|---|---|
| Twin | 38” × 75” | Ideal for single sleepers and children’s beds |
| Twin XL | 38” × 80” | Standard for college dorm beds |
| Full | 54” × 75” | Also called Double; suits single adults or couples with limited space |
| Queen | 60” × 80” | Most popular size for couples |
| King | 76” × 80” | Extra width for couples who want more space |
| California King | 72” × 84” | Narrower but longer than a standard King |
| Split King | Two Twin XL (38” × 80” each) | Two separate fitted sheets for adjustable bed frames |
All Mellanni fitted sheets have a full-perimeter elastic band and deep pockets that fit mattresses up to 16 inches thick — including pillow-top, euro-top, and memory foam mattresses. The elastic runs all the way around the sheet, not just at the corners, so the fitted sheet stays in place through the night.
Pillow sizes and pillowcases
Match your pillowcase to the actual dimensions of your pillow insert.| Pillowcase size | Fits pillow insert |
|---|---|
| Standard | 20” × 26” |
| Queen | 20” × 30” |
| King | 20” × 36” |
Duvet cover sizes
Mellanni duvet cover sizes correspond directly to standard comforter and duvet insert sizes available in the US. Match your duvet cover to the size printed on your insert’s label.| Duvet cover size | Fits standard insert size |
|---|---|
| Twin / Twin XL | 68” × 90” |
| Full / Queen | 90” × 90” |
| King / California King | 104” × 90” |
Quick size-selection tips
- Between mattress sizes? Size up on your sheet set for easier tucking and a neater look.
- Pillow-top or memory foam mattress over 12” deep? Mellanni’s deep-pocket fitted sheet (up to 16”) will accommodate it without popping off the corners.
- Using an adjustable base? Choose Split King — standard King fitted sheets will not stay in place on an articulating frame.
- Not sure which pillowcase? Measure your pillow along its long edge: up to 26” is Standard, 27”–30” is Queen, and 31”–36” is King.