Scientific Anglers - Amplitude Smooth Infinity Plus Fly Line

The Scientific Anglers Amplitude Smooth Infinity Plus Fly Line is a premium all-around fly line designed for anglers who demand maximum performance from modern fast-action fly rods.

Built on the renowned Infinity taper platform, the Infinity Plus features a full-size heavy design that loads powerful rods more efficiently while delivering exceptional casting versatility across a wide range of trout fishing applications.

Part of Scientific Anglers' flagship Amplitude Smooth series, the Infinity Plus incorporates revolutionary AST Plus slickness technology, resulting in significantly reduced friction, improved shootability, and outstanding durability. With up to five times less drag and eight times the durability of traditional fly lines, it delivers longer casts, smoother line handling, and reliable performance season after season.

The Infinity Plus taper is specifically engineered for anglers fishing larger trout rigs, indicator setups, heavier flies, and modern fast-action rods. By being one full line size heavy, it loads stiff rods quickly and efficiently. For anglers fishing slower-action rods or seeking a true AFFTA-standard line weight, underlining by one size creates an ideal balance of performance and feel.

Built on a braided multifilament core, the line offers excellent handling, durability, and versatility across a wide range of fishing conditions.

Key Features:

• Premium smooth fly line with AST Plus slickness technology
  
• Up to 5x less drag than traditional fly lines
  
• Up to 8x greater durability for long-lasting performance
  
• Full-size heavy taper designed for modern fast-action rods
  
• Based on Scientific Anglers' versatile Infinity taper design
  
• Excellent for larger trout rigs, indicators, and heavier flies
  
• Outstanding shootability and distance-casting performance
  
• Braided multifilament core for durability and handling
  
• Underline by one size for AFFTA-standard rod loading on slower rods

Whether you're making long casts on large rivers or fishing demanding trout setups, the Scientific Anglers Amplitude Smooth Infinity Plus Fly Line delivers the slickness, durability, and power needed to maximize performance on the water.

Q: What types of fly lines do you sell?
A: Drift Outfitters carries fly lines for every fishing style and species — from delicate trout presentations to heavy saltwater setups. You’ll find floating, sinking, and intermediate lines, along with specialty tapers for Euro nymphing, spey casting, and warmwater fishing.

Q: How do I choose the right fly line for my rod?
A: Match the line weight to your rod weight (for example, a 5wt line for a 5wt rod). The type of fishing you do matters too — floating lines are best for dry flies, while sinking or sink-tip lines are ideal for streamers or deep-water presentations.

Q: What’s the difference between weight-forward and double-taper lines?
A: Weight-forward (WF) lines have their weight in the front for easier casting and distance, making them the most popular choice for most anglers. Double-taper (DT) lines offer smoother roll casts and can be reversed for extended use — great for traditional or delicate presentations, however many weight forward lines also offer these benefits, making DT lines less popular.

Q: Which fly line brands do you carry?
A: We stock leading brands RIO, Scientific Anglers, Airflo, and more. Each brand offers premium coatings, slick finishes, and tapers designed for maximum performance in both fresh and saltwater.

Q: How do I clean and maintain my fly line?
A: Rinse your line with warm, soapy water and dry it with a soft cloth to remove dirt and buildup. Use a fly line cleaner or dressing periodically to restore slickness and extend its lifespan. Proper care keeps your line floating high and casting smoothly.

Q: How often should I replace my fly line?
A: With proper cleaning and care, most fly lines last several seasons. However, if your line begins to crack, lose buoyancy, or feel sticky, it’s time for a replacement to maintain casting performance.