From Nuna, this sibling seat features:

Recommended: Up to 50lbs.

MagneTech Secure Snap™, the self-guiding magnetic buckle that automatically locks into place

Easy to fold, flip the seat, and switch to bassinet or travel system modes

All-season seat changes with a zip

Sky drape™ provides extra protection from the environment

Removable, extendable & protective UPF 50+ canopy with flip out eyeshade

Three or five point no re-thread harness

Simple one-hand, three position reclining backrest

Add-on sibling seat transforms the classic stroller into a comfy ride for two

One-hand adjustable calf support for kids of all ages

Rotating and removable arm bar fits kids of all sizes

Opened box and unable return. Never been used.