• SEI MIO under-the-mattress bed restraint system – bondage kit with cuffs for couples – UK shipping
  • SEI MIO under-the-mattress bed restraint system – bondage kit with cuffs for couples – UK shipping
  • SEI MIO under-the-mattress bed restraint system – bondage kit with cuffs for couples – UK shipping
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SEI MIO The Bed-Spreader – Adjustable Under-Mattress Restraint Set

SEI MIO The Bed-Spreader – Adjustable Under-Mattress Restraint Set

£49.00 GBP
£49.00 GBP
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Shipping calculated at checkout.

Product Best For

Couples exploring BDSM, restraint play, and submission for the first time.

Beds without bedposts or headboards (uses mattress weight tension).

Sensory deprivation play (pairing restraint with blindfolds, feather ticklers, or orgasm gels).

Travel and hotel stays (lightweight, portable, and easy to pack).

Material Specs

Product Type: Under-Mattress Restraint System

Strap Material: High-density, heavy-duty woven Nylon

Cuff Material: Soft-lined fabric with Velcro/buckle closures & metal O-rings

Sizing / Fit: Fully adjustable; universal fit for Single, Double, Queen, and King size mattresses

Safety Feature: Quick-release metal carabiner clips

Box Contents

1 x SEI MIO Under-Mattress Adjustable Strap System

4 x Padded Comfort Cuffs (2 x Wrists, 2 x Ankles) with heavy-duty metal connector clips

Free UK Discreet Shipping Available

Free UK Discreet Shipping Available

📦 100% Discreet Packaging | 🇬🇧 Free UK Shipping On All Orders

Adjustable Restraint Play Without Bed Posts

The SEI MIO Bed-Spreader is an under-mattress restraint set designed for couples who want an adjustable bedroom setup without attaching equipment to a headboard or bed frame.

Key features

  • Under-mattress design: Position the central straps beneath a standard mattress.
  • Adjustable fit: Adapt the restraints to the bed and the people using them.
  • Easy to store: Pack the set away when it is not in use.

Use with care

Discuss boundaries and a stop signal before play. Keep safety scissors or a quick-release option within reach, check circulation regularly and never leave a restrained person unattended. Stop immediately if there is pain, numbness, tingling or distress.

Inspect every strap and fastening before use. Follow the instructions supplied with the product and do not use damaged components.

Delivery: Free UK shipping. Orders are sent in plain, unbranded outer packaging.

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