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Main page » Glasses » Other Glasses » Sunglasses » Julbo Sports Glasses Slack Cover - beige translucent glossy / black, smoky grey
Julbo Sports Glasses Slack Cover - beige translucent glossy / black, smoky grey
(Product No.: JB-J5871117)
.webp "Julbo")
SLACK was already bold and versatile enough to suit any occasion. SLACK COVER takes these characteristics of light weight and comfort, and adds removable shells on the sides and above the nose to transform your vintage glasses into a veritable summit exploration accessory. Featuring a double-bridge frame with bold styling, they are available in three lens options, including SPECTRON HD Polarized lens, a polarized lens that amplifies detail, enhances contrast and color, and reduces eye strain for uncompromising all-day comfort. SLACK COVER will have you loving the high-altitude environment more than ever before.
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| Age | Adults |
| Caliber (mm) | 52 |
| Spacing (mm) | 20 |
| Hinge Center to Center Distance (mm) | 138 |
| Height of the lenses (mm) | 45 |
| Temple length (mm) | 135 |
| Size | L |
| Weight (g) | 25 |
| Finish (Matte / Shiny) | TRANSLUCENT GLOSSY |
| Colours | Beige Translucent Glossy / Black |
| Glasses | Spectron 3 |
| Glass color | SMOKE GREY |
| Specific Lens Color for 1 SAGE Item | SMOKE GREY |
| Additional Coating | SILVER FLASH |
| Glass/pane material | Polycarbonate |
| Awning | Cat. 3 |
| Visible light transmission rate | '12% |
Julbo Size Chart
Note: Julbo uses different sizing systems depending on the product category. Helmets are selected by head circumference in centimetres. Sunglasses and goggles use product-specific fit and frame measurements. The size chart shown directly on the individual product page takes priority.
Helmets – General Guide
| Size | Head Circumference | Note |
|---|---|---|
| S / Small | 52–54 cm | Selected ski helmets, e.g. HAL fit range |
| M / Medium | 54–58 cm | Common Julbo ski and bike helmet size |
| L / Large | 58–62 cm | Selected ski helmets, e.g. HAL fit range |
| Junior / smaller heads | 50–54 cm | Selected junior and bike helmets, e.g. Sprint |
Helmets – Model Examples
| Model / Range | Published Sizes | Note |
|---|---|---|
| GLOBE REACTIV | 54–58 cm | Visor ski helmet |
| HYPERION MIPS® | 54–58 cm | Ski helmet |
| HAL / HAL Twiceme® / HAL EVO MIPS® | 52–54 / 54–58 / 58–62 cm | Depending on model and version |
| SHORTCUTS / SHORTCUTS NEXT | 54–58 / 58–62 cm | Depending on model and version |
| FAST LANE / ROCK and other bike helmets | 54–58 cm and other product-specific sizes | Check product page |
| SPRINT | 50–54 cm | Bike helmet / smaller heads |
Safety: A helmet must fit firmly, level and without pressure points. A helmet that is too large or too small can reduce protection.
Ski, Snowboard and MTB Goggles
| Fit / Size | Best For | Note |
|---|---|---|
| Small / Medium Goggle | small to medium faces | For small helmet sizes or narrow faces |
| Medium Goggle | medium faces | All-round fit |
| Large Goggle | medium to large faces | For medium to large helmets and wider field of vision |
| Extra Large Goggle | large faces | For large helmets and maximum coverage |
| OTG | eyeglass wearers | Over The Glasses; fits over many prescription glasses |
| Junior / Kids | children and youth | Smaller frame and face fit |
Goggles – Model Examples
| Model / Range | Fit | Note |
|---|---|---|
| Lightyear / Lightyear OTG | Large | Large spherical goggle; OTG version for eyeglass wearers |
| Launcher | Large / product-specific | Ski and snowboard goggle with SuperFlow Pro |
| Fusion | Medium | Ski and snowboard goggle |
| Ison | Medium | Ski and snowboard goggle |
| Shadow | Small to Medium | For medium and smaller faces |
| Kids' / Junior goggles | Junior / Kids | Check product page |
Goggle note: Julbo recommends choosing goggle size according to helmet size. Small helmets usually work better with small or medium goggles; medium and large helmets usually work better with large or extra-large goggles.
Sunglasses – Face Size
| Face Size | Best For | Note |
|---|---|---|
| Youth / Junior | children and youth | Smaller frame shape, shorter temples |
| Small | small faces | Narrow or compact frames |
| Medium | medium faces | Common all-round fit |
| Large | large faces | Wider frames or sports coverage |
| Extra Large | very large faces | Maximum coverage and wide field of vision |
Sunglasses – Understanding Frame Measurements
| Measurement | Meaning | Note |
|---|---|---|
| Lens Width | Width of one lens in millimetres | Defines the overall visual size of the frame |
| Bridge Distance | Distance between the lenses in millimetres | Important for nose fit |
| Temple Length | Length of the temple arm behind the ear | Important for secure fit without pressure |
| Lens Depth | Lens height from top to bottom | Important for coverage and field of vision |
| Base / Lens Curvature | Curvature of the lens | Base 8 is more curved and wraps around the face more |
Sunglasses – Model Sizes
These additional Julbo model sizes were added from the older chart and checked against currently available official Julbo fit information. Aerolite is marked as an older model / additional retailer reference because no fully readable current official Julbo fit page with all frame values is available.
| Model | Face Size | Frame Width (mm) | Lens Height (mm) | Bridge Distance (mm) | Temple Length (mm) | Base | Lens Width (mm) | Note |
|---|---|---|---|---|---|---|---|---|
| Explorer 2.0 | Large | 130 | 47 | 11 | 135 | 6 | 61 | Glacier and mountain sports sunglasses |
| Shield | Large | 130 | 45 | 17 | 130 | 6 | 59 | Mountain and outdoor sunglasses |
| Vermont Classic | Medium | 138 | 51 | 23 | 172 | 6 | 51 | Classic glacier sunglasses |
| Renegade M | Medium | 131 | 43 | 14 | 135 | 6 | 60 | Compact Renegade version |
| Fury | Medium | 135 | 53 | 15 | 115 | 5 | 131 | Performance sports sunglasses |
| Density | Extra Large | 148 | 59 | 15 | 138 | 5 | 135 | Performance sports sunglasses |
| Rush | Large | 137 | 58 | 14 | 130 | 6 | 136 | Performance sports sunglasses |
| Ultimate | Large | 135 | 50 | 14 | 130 | 6 | 133 | Performance sports sunglasses |
| Aerolite | Small / Medium | — | 45 | 14 | 131 | 6 | — | older model; additional retailer reference |
Sunglasses – Model Examples
| Model | Face Size | Bridge Distance | Temple Length | Lens Width | Note |
|---|---|---|---|---|---|
| Frequency | Medium | 13 mm | 123 mm | 52 mm | Sunglasses / performance |
| Shield M | Medium | 17 mm | 120 mm | 54 mm | Mountain and outdoor sunglasses |
| Liry | Medium | 12 mm | 133 mm | 64 mm | Lifestyle / sport |
| Renegade | Large | 17 mm | 135 mm | 61 mm | Outdoor / lifestyle |
| Millenium | Large | 21 mm | 140 mm | 55 mm | Lifestyle |
| Monterosa 2 | Medium | 15 mm | 125 mm | 54 mm | Mountain and trekking sunglasses |
| Intensity | Large | 14 mm | 130 mm | 54 mm | Performance sports sunglasses |
| Intensity Jr. | Youth | 13 mm | 115 mm | 64 mm | Junior performance sunglasses |
How to Measure and Check the Fit
| Category | Instructions |
|---|---|
| Helmet Head Circumference | Wrap the tape around the head about 2.5 cm above the eyebrows and ears. |
| Helmet Fit | The helmet sits level, about one to two fingers above the eyebrows. It should not shift when shaking the head. |
| Check Helmet with Goggles | The goggle should meet the helmet without a gap and should not press down on the nose. |
| Measuring Sunglasses | Use a well-fitting pair as reference and compare lens width, bridge distance and temple length. |
| Goggle Size | Julbo recommends choosing goggle size according to helmet size. |
Not every Julbo model is available in every size. For sunglasses and goggles, curvature, lens dimensions, frame width and helmet compatibility can affect the actual fit.