Guideline Slim Tri Foam Fly Box
The Guideline Slim Tri Foam is a compact, highly practical fly box designed for anglers who prefer carrying only the flies they need or organizing their patterns according to specific fishing situations. Built from durable polycarbonate with a crystal-clear lid and a premium Tri Foam insert, it offers excellent protection while keeping your favourite flies perfectly organized.
Its slim profile allows you to carry several fly boxes inside the pocket of a fly vest, jacket or sling pack without adding unnecessary bulk. The lime-coloured foam insert provides outstanding contrast, making it easy to locate the right fly even in low-light conditions.
What is the Guideline Slim Tri Foam?
The Slim Tri Foam is a premium fly box manufactured from impact-resistant polycarbonate with a crystal-clear lid. Inside, the precision-cut Tri Foam insert securely holds flies in place while allowing quick insertion and removal without damaging hooks or hackles.
With an internal height of 15 mm, the box comfortably accommodates larger parachute dry flies and upright-wing patterns up to approximately hook sizes #10–12 without crushing the wings. It is equally suitable for dry flies, nymphs and smaller streamers.
Technical Specifications
| Type | Slim fly box with Tri Foam insert |
| Material | Polycarbonate |
| Insert | Precision-cut Tri Foam |
| Internal Height | 15 mm |
| Medium Size | 156 × 107 × 27 mm • 130 fly slots |
| Large Size | 186 × 130 × 27 mm • 204 fly slots |
| Insert Colour | Lime for high visibility |
Why Choose the Guideline Slim Tri Foam?
- Ultra-slim design that fits easily into any vest or pack.
- Durable polycarbonate construction with a crystal-clear lid.
- Tri Foam insert securely holds flies in place.
- Suitable for dry flies, nymphs and smaller streamers.
- 15 mm internal height protects larger parachute and upright-wing flies.
- Lime-coloured insert provides excellent visual contrast.
- Available in Medium and Large sizes.
Organize Your Flies by Season or Technique
The Guideline Slim Tri Foam is an excellent choice for anglers who like to prepare dedicated fly boxes for different rivers, seasons or fishing techniques. Its slim profile makes carrying multiple boxes effortless, while the transparent lid and bright foam insert allow you to find the perfect fly in seconds.
Ideal For
Combining a durable polycarbonate body, compact dimensions, a premium Tri Foam insert and enough capacity for a wide variety of fly patterns, the Guideline Slim Tri Foam is a dependable fly box that deserves a place in every fly angler's equipment.