Welcome to a this week's roundup of new iPhone cases. In this edition, we look at the usual mix and match of great protective gear for your handset, including some models that have been created specifically with the environment in mind—always a worthy and noble cause, even when you're looking for the best way to keep your phone safe.

Case-Mate: The rPet Collection (iPhone 4 and 4S; $30) features snap-on hardshell cases made entirely of recycled PET—the stuff that plastic bottles are made of. In addition to helping the environment, the rPet is ultrathin and lightweight while still offering excellent protection. It's available in five translucent glossy hues—blue, pink, orange, green, or black—or a completely transparent version.

CalypsoCase: The Calypso Crystal (iPhone 4 and 4S; €99) is made from a combination of fine leather, a titanium frame for strength, a microfiber-cloth lining to provide a cushion for your iPhone, and silver trim for a luxurious touch. The Summer 2012 collection comes in Zurich Night (black with a red interior), Bilbao by Storm (lime green with a black interior), Austin Chill (tan with a black interior), or Bubbly Sydney (yellow with a black interior).

CM4: The Q-Card Case (iPhone 4 and 4S; $40) features a construction of soft-touch rubber and premium fabric for elegance and a great grip, and it sports a pocket that fits three credit or ID cards, as well as some paper money. The case comes in black or white, and also includes a lay-flat protector that keeps your screen safe from scratches.

Element Case: The company's Vapor Comp and Vapor Pro models (iPhone 4 and 4S; $100 and up) can now be customized based on your personal preferences. Each portion of the case, including the sides, back, and even the screws, can be had in any of over a dozen hues and finishes to match the color combination you like best.

Griffin Technology: The Elan Form Chilewick (iPhone 4 and 4S; $40) brings together Griffin's popular Elan case, with its sturdy construction and tough protection, with designer Sandy Chilewick's trademark vowen vinyl textile for a unique look that comes in five different patterns, resulting in a unique combination of sturdiness and soft feel.

InCase: The Hammered Snap (iPhone 4 and 4S; $35) is a hardshell case that features a unique appearance combining the look of hammered metal with a special soft-touch coating that feels great in your hand. The Hammered Snap comes in silver, red copper, gold, or iron.

Otterbox: The Reflex Series (iPhone 4 and 4S; $35) brings a cool new look to Otterbox's well-known protective accessory. This two-piece case can be easily installed and removed, and is available in nine different color combinations.

PureGear: The Utilitarian (iPhone 4 and 4S; $40) includes a comfortable and durable Grip Case, a clip-on holster, and two kickstands, perfect for for viewing your phone in either landscape or portrait orientation. The case is available in black or white, and is meant to work as a complete transport solution for your iPhone that keeps your hands clean at all times.