Fat Boy™ Ultra Fat Sheath 5.5” - Medium

The Fat Boy Ultra Fat Sheath in 5.5" Medium from Perfect Fit is a soft, clear cock sheath built to add girth for your partner and texture for you. The Medium size is the one to pick if a longer sheath would leave empty space at the tip, so it sits snugly and stays put. It's the same SilaSkin design that was once called the Fat Boy Sport.

SilaSkin: soft, stretchy and skin-like

The sheath is made from SilaSkin, Perfect Fit's blend of TPR and silicone. It's very soft and very stretchy, with a silky surface that feels closer to skin than firm silicone does. That stretch is what makes it comfortable to wear: it hugs rather than squeezes, and it rolls on and off more easily than you'd expect for something this thick. The sheath is clear, so it looks less like a costume piece and more like a natural extension.

Perfect Fit made the first soft stretchy sheath years ago, and the Fat Boy line grew out of a simple aim: an extender that lets both partners reach orgasm, rather than one that leaves the wearer feeling nothing. That's why the inside is textured and why the material is so soft. A firm hollow strap-on can give more length, but this one keeps more of the wearer's own sensation.

What the extra girth feels like for a partner

Perfect Fit says the walls add about 1 inch of girth. For the receiving partner, that's a noticeable step up in fullness and stretch, whether for vaginal or anal sex. Go slowly the first time, use plenty of lube, and let the receiving partner set the pace while they get used to it. The closed tip means the head is covered, so the sensation is consistent along the whole length.

A stroker on the inside

Inside, the sheath is lined with nubs and ribs. For the wearer, every thrust drags that texture along the shaft, so you get sensation from the toy as well as from your partner. It also works on its own as a stroker for solo play, and a partner can slip a hand inside it and use it as a textured masturbation sleeve on the wearer.

How to put on a cock sheath

Add a little lube inside the sheath, and more on yourself. Stretch the opening, slide in until the tip settles into the closed end, then bring the thick loop under and around the base of the scrotum. The loop keeps the sheath from slipping off and gives the balls a gentle tug during movement. Because that loop works like a cock ring, take the sheath off after 20 to 30 minutes, or at once if anything feels cold, numb or painful. Then add lube to the outside before penetration.

Cleaning SilaSkin

Wash the sheath inside and out with warm water and mild soap after every use, flexing it so the water reaches all the internal texture. Let it air-dry fully before storing it. A light dusting of cornstarch keeps the surface silky. Water-based lube is the safest choice for this material.

Specifications

• Brand: Perfect Fit, Fat Boy Ultra Fat Sheath (formerly Fat Boy Sport)
• Type: closed-tip girth sheath with scrotum loop
• Material: SilaSkin (TPR/silicone blend)
• Girth added: about 1" (maker's figure)
• Interior: nubs and ribs
• Size: 5.5" Medium, clear. Also in 7" Large

See more from Perfect Fit, or read our guide to sex toys for men.