I am not affiliated with this brand and it is not sold on Amazon -Destiny

The difference between the Nuna Pipa AIRE Rx and the Nuna Pipa Rx: 

• The Pipa AIRE Rx is one of the lightest infant car seats available (5.7lbs without base opposed to the Nuna Pipa Rx (7.7lbs without the base)
• The Pipa AIRE Rx has better ventilation 
• The Pipa Rx has a heavier base
• The Pipa AIRE Rx has a bigger canopy for sun protection

Both have great safety features and use quality materials. 

The PIPA rx is suitable for a child 4 to 32 lbs and up to 32 in, or until approximately 18 months of age

Materials

• The fabric of the Pipa RX is made from a combination of soft polyester and nylon (The fabric is also treated to be free from harmful chemicals such as BPA, phthalates, and fire retardants)
• The canopy is made of nylon fabric
• The harness system is made from nylon webbing
• Organic jersey insert with two removable pieces

- From fabric to foam and beyond, each element is smartly sourced to be both flame resistant and contain no added fire retardant chemicals

- GREENGUARD Gold Certified: Products that have achieved GREENGUARD Gold Certification are scientifically proven to meet some of the world's most rigorous third-party chemical emissions standards, and certified to not contribute to indoor air pollution or chemical exposure

Benefits:

• Side impact protection for ultimate baby safe keeping
• Comfy organic jersey insert is removable for growing babies
• Integrated harness holders help when buckling baby in
• Luxe leatherette accented carry handle. Tote elegantly with ease
• Five point harness keeps little ones in place
• Two-piece removable infant insert + head support. Customize to their individual shape and get a perfect fit right from birth
• Mesh peek-a-boo window in canopy
• Heavy duty shell is super resilient yet lightweight
• Lightweight carry handle is ergonomically designed to tote with ease
• FAA certified for aircraft use
• True lock™ installation makes set up swift, simple and above all – safe
• 5 second install
• Crumple zone within the stability leg absorbs impact and minimizes force transferred to baby
• Colored installation indicators confirm correct connections to the vehicle
• Bubble free recline angle guides clearly confirm the perfect riding angle
• Low profile base for easier loading of infant seat
• Open belt path for easier install
• Belt guides
• Anti rebound panel
• Automatic rigid latch storage
• Extra convenient stability leg storage with lock
• Steel reinforced true lock™ rigid latch
• Lock off with easy access belt path
• Indicators on rigid latch turn green when clicked to vehicle anchor points
• Indicators on stability leg turn green when in proper contact with vehicle floor
  

Nuna: 

⭐️ Nuna was founded in 2007 in the Netherlands. Since then, it has become a globally recognized brand, especially in North America and Europe

⭐️ Nuna has a strong reputation for customer satisfaction, offering excellent customer service and a solid warranty on their products

Nuna products are designed in the Netherlands, but the manufacturing of most of their products takes place in China