what are double sleeved cards

what are double sleeved cards legal for official Yu-Gi-Oh events? Double Sleeving worth it? :

Name: what are double sleeved cards legal for official Yu-Gi-Oh events? Double Sleeving worth it? :
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SKU: 51947808125
Price: 20.46 USD
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SKU: 51947808125

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Description

The Sword & ShieldEvolving Skies expansion features over 200 cards to collect and the Dragon-type Pokmon return with a new look

She will then rule both Snows kingdom of Aradon and the Princes kingdom of Mirador

Luckily, if you've been holding off on adding this card to your collection, now might be the perfect time to finally get it, as this fabulous full art has fallen from its previous highs of around $75