Cottingon 4-Piece Flex Head Split King Sheet Set - Dark Grey, 100% Egyptian Cotton, Top-Split 34"

Cottingon’s 4-piece Flex Head Top Split King sheet set is a dark-grey, 100% Egyptian cotton bedding set designed to fit adjustable split-top king mattresses while delivering breathable, soft comfort night after night.

These sheets combine extra-long staple Egyptian cotton with a tailored half-split fitted sheet to accommodate adjustable or split-head king beds such as Sleep Number, Flex Top King, and other dual-motion mattresses. The set includes two pillowcases, a generous flat sheet, and a 34" top-split fitted sheet with full 360-degree elastic engineered to stay in place on adjustable mattresses. OEKO-TEX certification ensures the fabric is free from harmful substances, and the weave softens with washing to develop a lived-in, comfortable feel.

How will these sheets work with my adjustable split-top king bed?

The top-split fitted sheet has a 34" split at the head, allowing each mattress side to move independently without bunching or pulling. Extra-wide elastic runs around the entire fitted sheet to keep fabric secure when the mattress flexes, and the tailored dimensions accommodate standard split king configurations.

• Half-split 34" top lets each side elevate independently.
• Full 360° elastic holds the sheet on during adjustment.
• Designed for Sleep Number, Flex Top King, and split-head mattresses.
• Fits mattresses up to 16" depth for adjustable layering.

What is the fabric like and how should I care for it?

The sheets are woven from 100% extra-long staple Egyptian cotton for a soft, breathable textile that improves with laundering. OEKO-TEX certification verifies that the fabric meets strict safety standards. Follow simple care steps to preserve texture and color: machine wash in cold or lukewarm water, tumble dry low, avoid bleach, and iron if desired.

• 100% Egyptian cotton with extra-long staples for lasting softness.
• Machine wash cold or lukewarm; tumble dry low; do not bleach.
• Softens after a few washes for a silkier hand-feel.
• Colorfast dark grey keeps a refined look across washes.

What pieces come in the 4-piece set and what are the measurements?

The set includes two pillowcases, one oversized flat sheet, and a half-split fitted sheet sized for split-top king use. Pillowcases measure 20" x 40", the flat sheet measures 102" x 108", and the fitted sheet measures 34" (split top) x 78" x 80" with stretch to fit up to 16" mattress depth.

• 2 pillowcases: 20" x 40" each.
• 1 flat sheet: 102" x 108" oversized for tuck-in options.
• 1 half-split fitted: 34" top split, fits 78" x 80" mattress footprint.
• Fits mattresses up to 16" deep with full elastic encasing.

How will these sheets look and feel in my bedroom?

Dark grey provides a modern, neutral backdrop that pairs well with bold or soft décor. The fabric drapes smoothly and develops additional softness with regular washing, creating a polished yet cozy appearance. Because the set is tailored for function on adjustable beds, it stays neat and fitted even when the head or foot moves.

• Contemporary dark grey complements most bedroom palettes.
• Smooth drape for a neat, hotel-like presentation.
• Durable weave resists pilling and preserves color.
• Engineered fit reduces bunching on adjustable motions.

Who is this for: Cottingon’s 4-piece Flex Head King sheet set is ideal for sleepers who own split-top or adjustable king mattresses and want 100% Egyptian cotton comfort in a tailored set. It suits couples with independent bed motion, anyone seeking OEKO-TEX‑certified materials, and shoppers who prefer a refined dark-grey palette for master bedrooms, guest rooms, or vacation properties.