SEI MIO - The Bottom Line - Discreet Under Mattress Restraint System

SEI MIO The Bottom Line is a set of under mattress restraints that stays out of sight until you want it. An adjustable webbing strap system lies beneath the mattress with six D-ring attachment points, and a set of plush wrist and ankle cuffs clips on when play begins. Unclip the cuffs and the bed looks like any other bed, which is the whole point of the name.

Setting up under mattress restraints

Lay the webbing under the mattress and adjust it so the D-rings sit close to where wrists and ankles will rest. SEI MIO says it suits most mattresses, king and super king included, and the adjustable straps take up slack on smaller beds. Do the first fitting with the bed empty: lie down, see where the rings land, and take up the webbing so it doesn't creep when someone pulls against it.

Six points, more than one position

Six D-rings give you options beyond the classic spread-eagle. Four rings hold arms and legs apart; moving the cuffs to different rings brings the wrists closer, raises the wearer's position or angles the body for teasing and impact play. Start with a loose reach and shorten it in small steps rather than going straight to a full stretch, which is far kinder on shoulders.

Ground rules for bed restraint

Agree a safe word before anyone is cuffed, and a second signal for moments when speaking is hard. A cuff is right when two fingers slide underneath. Watch hands and feet for coldness, tingling or colour change, stay in the room the whole time, and keep safety shears on the bedside table in case a strap won't release.

Care

SEI MIO's care label asks for spot cleaning only; skip bleach, the dryer, the iron and dry cleaning. Wipe the cuffs with a damp cloth and mild soap after use and let them air-dry before storing them away from the bed.

Specifications

• Brand: SEI MIO by Creative Conceptions
• Type: under-mattress restraint system
• Included: adjustable webbing strap system and one set of plush wrist and ankle cuffs
• Attachment points: six D-rings
• Bed fit: most mattresses, including king and super king (maker's statement)
• Hardware: nickel-free
• Care: spot clean only
• Strap lengths and cuff sizes: not listed by the maker

Slide the Elevated Interests wedge under the hips for a raised angle, browse more restraints and bondage cuffs, or start with our guide to exploring BDSM.