Ultimate Guard Cortex Card Sleeves (100 Pack) – Standard Size 66x91mm, Yellow Back, Glossy, Acid-Free
Ultimate Guard Cortex Card Sleeves (100 Pack) – Standard Size 66x91mm, Yellow Back, Glossy, Acid-Free
Ultimate Guard Cortex outer card sleeves in yellow back with a glossy finish provide a clear, durable layer of protection for standard-size trading cards (66 x 91 mm). Each pack contains 100 sleeves, weighing 137 grams, and are designed for frequent gaming without damaging cards. They are a more affordable alternative to the brand’s Katana sleeves, yet still offer high opacity and a smooth shuffle feel.
What makes Cortex sleeves different from Katana?
Cortex sleeves are built for daily use with a lower price point while maintaining quality. Katana represents Ultimate Guard’s top-tier construction, but Cortex delivers a solid shuffle feel and durability for regular play. Both use premium materials, but Cortex aims for an everyday balance.
Glossy finish: pros and cons
The glossy front lets card art show true colors, but in bright settings it can cause reflections. If you play under direct light, you might prefer a matte finish (available separately). Both options have opaque yellow backs to hide card information and keep your deck uniform.
Why acid-free and PVC-free matters
Acid and PVC can cause gradual yellowing or brittleness in cards over time. Cortex sleeves are free of both, so they won't harm your collection. This makes them a safe choice for long-term storage or frequent handling.
Dimensions and build details
| Brand | Ultimate Guard |
| Product | Cortex Outer Sleeves |
| Size | 66 x 91 mm (Standard) |
| Color Back | Yellow |
| Finish | Glossy (front) |
| Quantity | 100 sleeves |
| Material | Plastic, acid-free, PVC-free |
| Weight per pack | 137 grams |
Common questions about Cortex sleeves
Can I use these sleeves for double-sleeving?
Yes. Cortex sleeves work well as outer sleeves over inner sleeves like Ultimate Guard Katana inners. They have enough room for a standard-size inner sleeve, offering extra protection for valuable cards.
Are these sleeves suitable for Yu-Gi-Oh?
No. Cortex standard size (66x91mm) fits Magic: The Gathering, Pokémon, and similar games. For Yu-Gi-Oh, choose the Japanese size version of Cortex sleeves.
How many sleeves are in a pack?
Each pack contains 100 sleeves, enough for a standard constructed deck plus sideboard in many TCGs.