





🔥 Shield your gear like a pro—because failure is not an option!
Design Engineering Heat Sheath™ Aluminized Sleeving is a premium 3/4" I.D. x 3 ft protective sleeve engineered to reflect radiant heat up to 2000°F and withstand direct heat up to 500°F. Constructed from 19 oz high-temp fiberglass insulation bonded to a durable aluminized outer layer, it offers superior abrasion, chemical, and fire resistance. Designed for easy slip-on installation, it safeguards hoses, wires, and cables in demanding automotive and industrial settings. Proudly made in the USA for unmatched reliability and peace of mind.




| Manufacturer | Design Engineering |
| Brand | Design Engineering |
| Model | Design Engineering Heat Sheath |
| Item Weight | 3.2 ounces |
| Item model number | 10403 |
| Is Discontinued By Manufacturer | No |
| Exterior | Design Engineering Heat Sheath-Aluminized Sleeving 3/4"X36" - Sewn |
| Manufacturer Part Number | 10403 |
| OEM Part Number | 010403 |
| Position | Center |
P**L
It's DEI Heat sheath - great stuff but expensive
Look, when you need this stuff, it's worth the price. It works, and does the job of protecting the wires or hoses it's supposed to. I think it's a bit expensive, but you buy this for reliable protection, and that's what you get. Sure, there are off brand stuff similar, but I paid for the peace of mind DEI provides. Used to protect 1/0 starter cable on my LS truck motor from header heat.
T**S
Worked great
Had to run a starter wire on my Mustang an inch from the headers. Was uncomfortable with leaving it unprotected so I did this. Been running 2 months no problem
J**N
Manages heat well
Excellent heat wrap. Just wear thick gloves the fibers get stuck in your hands
H**R
Looks good
Looks like quality. Although I really thought I ordered the one that had Velcro so you could apply without removing stuff. But this should work fine for shielding starter wires
K**R
Quick delivery
I used a 3/4" x 3 feet sheath. It was used around a 0awg (8.25mm) start cable that was installed in close proximity to the catalytic converter. The starter solenoid wires were double shielded, so I folded the 3/4" sleeve and used stainless steel ties to hold the folded sleeve in place around the 0awg cable. + Seems to be av good quality materials. + Good stitching. - Large flap with company logo (Understand logo solution - removed flap for cleaner install)
H**N
Great heat resistance. DEI great brand
Great heat resistance. DEI great brand
J**R
Must have line disconnected to use this.
I have always had good experiences with DEI products but I think this listing is a little misleading. When you look at the listing there is a video which very clearly displays velcro on the product. This would indicate that the product can be applied to lines without removing them first which isnt the case. Again the product is a great value and performs well but I think this listing could be a little more clear.
D**1
Really nice for what I paid
Nice quality. Really fast shipping. I'm using it to protect my battery cable from the headers.
Trustpilot
1 month ago
2 months ago